Improved method and apparatus for combined transmission dispatching in wireless network. RU patent 2508615.

FIELD: radio engineering, communication.

SUBSTANCE: method involves determining if two user devices (UE) in a wireless network can be jointly dispatched by an uplink scheduler. The method involves determining orthogonality coefficients for each pair of devices to be considered and, from the orthogonality coefficients, selecting UE to be jointly dispatched.

EFFECT: optimum selection of UE for combined transmission such that residual interference is minimised.

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The technical field to which the invention relates

This invention relates to a device and method of joint dispatching transmission of subscriber devices. Invention is suitable for use in wireless networks and, more specifically, for use in base stations of wireless networks.

The level of technology

In wireless networks, great attention is paid dispatching transmission in the time and frequency areas of customer equipment (UE) in the base station. If the UE are spatially close to each other and there is a considerable overlap in time and frequency, with which the transmission on the uplink connection from the UE are sent to the base station, between the transmission UE experience interference. This interference can mean that the amount of information per transfer package of each UE, which can be successfully decoded, is small (i.e. they may have to choose the alphabet modulation of a lower order).

Traditionally, to overcome this drawback, the network is prescribed for each UE, is transmitted to the base station, a different unit of frequency-time resources, in which you can pass. Because the UE in the cell now not interfere with each other, each of them can send more information per transfer package (for example, through the choice of alphabet higher-order modulation).

However, the assignment of individual (unused together) blocks the frequency-time resources limits the resource allocated package transmission UE, because a complete resource in a wireless environment, in General, fairly shared between users.

One technology that is used to make more efficient use of the available resources, encompasses joint dispatching pairs UE in an identical block frequency-time resources. In this technology UE only in that case when the signals from the UE considered sufficiently separated spatially. However, when joint dispatching implemented thus, residual interference can still occur in the receiving device, for example, due to remaining overlap between the signals of the UE, reducing the amount of information per transfer package of each UE, which can be successfully decoded. The invention described in this document, refers to the technologies for the optimal choice of UE for a joint transfer, so that all the remaining residual interferences are minimized.

The essence of the invention

According to the aspect of the invention provides a method for selection of subscriber devices for joint dispatch of the wireless network and the wireless network consists of a receiving device includes lots of aerials, and a multitude of devices, each subscriber unit includes one antenna, the method contains the definition of the indicator for each transfer of subscriber unit in the receiving device, the comparison characteristic of the transmission of each subscriber unit with a transfer to another subscriber device to detect signs of orthogonality, and selecting a pair of devices with the greatest for simultaneous transmission. By determining the orthogonality signs of subscriber devices, least likely to have to interfere, can be identified and jointly .

Optional sign may be managing a vector for the transmission of a subscriber unit, which ensures identification of the UE with the highest spatial separation. Orthogonality can be calculated using the conjugate transpose of the trait.

UE for joint dispatching preferably passed through the channel in which the change of the phase and amplitude of tones during transmission is essentially agreed. This means that there is minimal change in the characteristics of transmission during transfer, and, consequently, the interaction between the transmission UE are relatively constant.

Preferably each additional pair of subscriber devices together with a decrease levels of orthogonality. This means that couples of subscriber devices together the reverse of the order in which they are most likely to must interfere.

Additionally, it is preferable that each pair of subscriber devices together only if the coefficient of orthogonality is below the threshold, since it means that only the transfer with a fairly low interference between the . Coefficient of orthogonality preferably coefficient is measured between 0 and 1, and the ratio of orthogonality of zero means that transfer are completely orthogonal, and the coefficient of orthogonality, equal to one means that the transfer are collinear.

Optional, modified ratio of orthogonality can be calculated by multiplying the coefficient of orthogonality of the correction factor. A correction factor can be, for example, greater SINR of SINR for each subscriber unit in a pair of devices, Log 10 (SINR MAX), or the highest function SINR for each subscriber unit in a pair of devices. This prevents joint dispatch of a noisy signal and reduces the likelihood of interference between the transmission of the two user devices. An additional factor can also be put to prefer dispatching of subscriber devices with almost equal SINR. An example of this additional factor should be the attitude of "SINR MAX to SINR MIN ".

The method may include additional steps to define the bandwidth of devices and, if the combined throughput is less than the threshold, a separate dispatch of subscriber devices. An example of a threshold value is the threshold value of the bandwidth when two transfer of subscriber devices separately.

Bandwidth for each subscriber unit separately and throughput for each pair of the combined subscriber devices can be calculated, and the subscriber device or a pair of devices, with the highest throughput, first. This provides bandwidth to the maximum extent possible.

According to another aspect of the invention provides a scheduler ascending line of communications to jointly subscriber devices on the wireless network, which includes entrance to make the sign of the transfer of the subscriber terminal module comparisons to compare the sign of transfer of each subscriber unit to identify signs of orthogonality, and processor to choose a couple of subscriber devices with the greatest for simultaneous transmission.

Optional sign may be managing a vector for the transmission of a subscriber unit, the base station.

Scheduler ascending line of communication can optionally include the module selection of channels to choose the channel in which the change of the phase and amplitude of tones during transmission is essentially agreed in the time and frequency measurements. Subscriber units make up the group, from which the subscriber units together are selected device that can pass through the canal.

Modified coefficient of orthogonality can be a sign of x greater SINR" of SINR for each subscriber unit in a pair of devices.

Preferably a processor calculates the bandwidth for each subscriber unit separately and bandwidth for each pair of the combined subscriber devices and selects the approach that maximizes throughput. For example, this can be done through joint dispatching the first subscriber unit, or a pair of devices, with the greatest bandwidth. Additional pairs of subscriber units or individual subscriber devices together with a decrease levels of throughput.

Under an additional aspect of the invention provides a base station, which includes the scheduler ascending line of communications to jointly subscriber devices on the wireless network, which includes a receiving device to accept the filing of a subscriber unit, and the scheduler ascending line of communication, which includes module comparisons to compare the sign of transmission for transmission of each subscriber device to detect signs of orthogonality, and processor to choose a couple of subscriber devices with the greatest for simultaneous transmission.

According to another to another aspect of the invention provides a computer software product, which includes media, having saved a computer program logic to provide the opportunity for the scheduler ascending line: take the sign for each transmission of a subscriber unit in the receiving device, compare sign of transfer of each subscriber unit with sign the transfer of another subscriber device to detect signs of orthogonality, and choose a couple of subscriber devices with the greatest for simultaneous transfer between subscribers ' devices and the receiver.

Brief description of drawings

Other aspects and features of the present invention should become apparent to those skilled in the field of technology in studying the subsequent descriptions of specific embodiments of the invention in conjunction with the accompanying drawings.

Fig. 1 illustrates the cell in a wireless network that can be implemented to the present invention;

Fig. 4 and 5 are the flowchart sequence of alternative ways of joint dispatching UE in the wireless network.

A detailed description of the preferred options for the implementation of

Fig. 1 illustrates the cell 2 in the network, which may be implemented with the present invention. Invention is preferably OFDM network that includes many of the UE 4 and receiving station 6. UE 4 have a single antenna and receiving station 6, for example, the base station has two receiving antenna, as illustrated in Fig. 2.

Base station 6 includes scheduler ascending line communications for scheduling programs on the uplink connection from the UE 4 in the docking station 6. Scheduler ascending line of communication defines the unit of frequency-temporal resources UE 4 can be used to transfer data. In the present invention scheduler ascending line connection is additionally completed with the ability to determine that they have two or more UE 4 transmit simultaneously in the same time slot channel uplink connection without a significant reduction in signal quality of the UE 4.

First, as illustrated in step 10 in Fig. 3, scheduler uplink connection selects the channel that can be applied joint dispatching. The selected channel can be any group of tones in which a change in the phase and amplitude of tone is essentially agreed as in the time and frequency measurements during transmission. Once the channel is specified, UE, that can transfer in a channel can be identified, as illustrated in step 12.

After UE identified pilot tone for each of the UE in the group are analyzed to evaluate the control vectors for each of the UE, as illustrated in step 14. Pilot tone can be of recent transmission on the uplink connection from these UE or from specially "probing packets" ascending line of communication. Any suitable way of assessing the channel can be used to evaluate the control vectors for each of the UE.

For each UE, transmitting from one antenna to the base station with two antennas, transmission UE should have a governing vector. Managing vector that includes one (integrated) element for each antenna, is as follows:

Thus, for a simple implementation in the channel with two subscriber devices, UE1 and UE2, antenna vectors H1 and H2 for each of UE1 and UE2 respectively the following:

After controlling vectors for each UE defined at step 14, the coefficient of the orthogonality between managers vectors UE1 and UE2 is calculated in step 16, using conjugate transpose:

After the rate of orthogonality is defined, the scheduler ascending line of communication may determine or below the ratio of orthogonal predetermined threshold, as illustrated in stage 18. If the ratio of orthogonal below the threshold, that is passed through two UE may be jointly , as illustrated at the stage of 20. However, if the ratio of orthogonal above the threshold, that is passed through two UE should create too strong interference to each other, and UE instead separately, as illustrated on stage 22.

Specialists in the art to understand that any other appropriate equation can be used to determine the coefficient of orthogonality, and the coefficient of orthogonality is a representation of orthogonal gear two UE.

If you have more than two UE in the channel that is selected in step 10, the same comparison can be made between each pair of UE in the group of UE in the channel. The comparison determines the kind of couple UE has the lowest coefficient of orthogonality and, consequently, a pair of UE in the group is most suitable for joint dispatching. For example, when there are five UE, transmission in a channel in the docking station with the following managers vectors:

The coefficients of the orthogonality between each pair of UE then calculated using the conjugate transpose, as described above, taking into account the coefficient matrix of the orthogonality:

As you can see, the coefficient of the orthogonality between UE 2 and 4 is the lowest when to 0.127. Thus, the scheduler ascending line of communications together dispatch transfer UE 2 and 4. UE 2 and 4 then removed from the group UE negotiated through scheduler ascending line for joint dispatching.

The smallest ratio of the orthogonality between the remaining UE, UE 1, 3 and 5 is between UE 1 and UE 5. Scheduler ascending line of communication, therefore, together dispatch transfer UE 1 and UE 5. UE 1 and 5 are also excluded from further consideration to the joint dispatch. UE 3 generally not together with other UE, and he, therefore, is assigned its own time quantum.

Optional, scheduler ascending line of communication can apply the threshold value of the ratio of orthogonal and prevent joint dispatching pair UE, with a coefficient of orthogonality is above a threshold. For example, in the example above with respect to the five UE, the threshold value can be set equal to 0.5. If the threshold value will at this level, then the scheduler ascending line of communication not dispatch together UE 1 and UE 5, because the coefficient of orthogonality (0,53) above the threshold. In this case, the scheduler ascending line of communications together dispatch UE 2 and 4, because the coefficient of orthogonality is below the threshold, and UE 1, 3 and 5 separately.

Optional, the coefficient of orthogonality can be modified so that it takes other factors. For example, SINR (signal-to-interference-noise") to be considered. This is because if there is a signal with high SINR, should be a priority to use higher-order modulation, which can be vulnerable to interference from jointly user. One way to account for the SINR now described with reference to Fig. 4.

The method is identical to the method described earlier with reference to Fig. 3, except that after calculation of the coefficient of orthogonality for a pair of UE in step 16, ratio of orthogonality is multiplied by the greater SINR each of the two UE used to calculate the orthogonality, as illustrated in step 24. "The ratio of orthogonal x largest SINR" for each pair of UE in the group UE, transmitting in the channel, is compared. Pair UE with the least "OF X SINR together , as illustrated at the stage of 28. Additional pairs of UE by comparing this "OF X SINR" the remaining pairs UE until all pairs of UE not together.

In addition to the multiplication factor of orthogonality on SINR, the coefficient of orthogonality can be multiplied by a function of the greatest SINR belonging to one of the UE. One example of this function is Log 10 (SINR MAX ), although experts in the art to understand that any suitable function can be used.

Optional, the threshold value can be set so that if the ratio of orthogonality, multiplied by the maximum SINR above the threshold values, UE with the maximum SINR not together with other UE. Alternatively, SINR for each UE can be determined, and SINR for each UE is then compared with a threshold SINR. For any UE, in which SINR exceeds the threshold SINR, scheduler ascending line of the connection specifies that the UE shall be jointly with other UE, and UE separately. For the UE, in which SINR below the threshold values of the coefficients of the orthogonal are defined, and transfer together , as described with reference to Fig. 2.

Alternative factors may be considered in lieu of or in addition to SINR. For example, the bandwidth of a pair of UE.

In an alternate embodiment of the present invention scheduler ascending line of communication can determine jointly or no UE, using the method shown in Fig. 5. As explained with reference to Fig. 2, the channel is determined (not shown), and the pool UE, which transmit data across the channel is also determined by the phase 30.

For each pair of users the minimum mean square error (MMSE) transmission UE is calculated by combining a set of weights, as illustrated at the stage of 34. Using sets of weights for the MMSE potential SINR for each user can be calculated, as defined at the stage of 36. Throughput combined transmission two UE can then be determined as specified stage 38. Bandwidth can be calculated using a set of codes Shannon or set of control codes (MCS) or any other appropriate way.

Simultaneously bandwidth for each individual UE is also calculated, step-40. This bandwidth can be calculated using any appropriate method.

Any suitable technology can be used to share together transfer of two of subscriber devices, for example, instead of MMSE approach SIC (serial interference suppression) can be used. Additionally, any alternative criteria other than bandwidth, can be used to define what UE . For example, equal to the throughput (EQT) for each user can be calculated and then compared.

Additionally, the scheduler ascending line of communication can jointly UE only if the full capacity of the transmission together UE below the threshold. Alternatively, the coefficient of orthogonality for each pair of UE can be determined and used to determine jointly or no UE in a pair, or, if they should not be together .

As indicated above, a comparison of the UE and couples UE continues until all users are not .

It is preferable that the time constant dispatching for the UE was shorter time than the time constant changes of the small-scale fading (SSF) in the channel. Therefore, it is preferable that the UE, which together were mobile or stationary, so that the changes due to the SSF are slow due to the low levels of Doppler broadening. Scheduler ascending line connection can be made with the ability to determine whether the UE mobile, such as your cell phone, or mobile or landline, for example portable computer.

Joint dispatching can be applied to one or more of the bands in the transmission channel. Outside of these bands UE the traditional way. Any other suitable method for the calculation of the orthogonality can be used.

Any of the methods can be applied to a network or part of a network that has a particular receiving station and several transmitting stations, the receiving station is greater than or equal to the number of antennas compared with the total number of transmit antennas UE UE that can be jointly in an identical block frequency-time resources.

1. Way selection of subscriber devices for joint dispatch of the wireless network and the wireless network includes receiving station and a variety of consumer devices, and receiving station includes set of antennas, each subscriber unit includes one antenna, the method contains the stages at which: a. define managing vector for each transmission of a subscriber unit in the receiver; b. compare managing vector of each pair of devices to determine the ratio of orthogonal vectors of governors; and c. perform joint dispatch of the first pair of subscriber devices for simultaneous transfer only if the corresponding factor of orthogonality is below the threshold.

2. The method of selection of subscriber devices for joint dispatch in a wireless network, according to claim 1 in which the orthogonality calculated with the use of the work of governors of the vectors, the work includes the conjugate transpose one of the managers of vectors.

3. The method of selection of subscriber devices for joint dispatch in a wireless network, according to claim 1 in which the subscriber units for joint dispatching passed through the channel in which the change of the phase and amplitude of tones during transmission is essentially agreed.

4. The method of selection of subscriber devices for joint dispatching the wireless network of claim 1, wherein the first pair of devices is a pair of devices, has the lowest coefficient of orthogonality, and each additional pair of subscriber devices together higher values of the coefficient of orthogonality.

5. The method of selection of subscriber devices for joint dispatch in a wireless network, according to claim 1, where the joint dispatch of the first pair of devices is based on a modified ratio of orthogonal containing factor of orthogonality, multiplied by the highest SINR of SINR for each subscriber unit in the first couple of subscriber devices.

6. The method of selection of subscriber devices for joint dispatch in a wireless network, according to claim 1, where the joint dispatch of the first pair of devices is based on a modified ratio of orthogonal containing factor of orthogonality, multiplied by a function of the greatest SINR for each subscriber unit in the first couple of subscriber devices.

7. The method of selection of subscriber devices for joint dispatch wireless network 6, in which the function of the greatest SINR is the Log 10 (SINR MAX ), and SINR MAX is the highest SINR for each subscriber unit in the first couple of subscriber devices.

8. The method of selection of subscriber devices for joint dispatch in a wireless network, according to claim 1, where the joint dispatch of the first pair of devices is based on a modified ratio of orthogonal containing factor of orthogonality, multiplied by the ratio of "SINR MAX to SINR MIN ", and SINR MAX is the highest SINR for each subscriber unit in the first couple of subscriber devices, and SINR MIN is the minimum SINR for each subscriber unit in the first couple of subscriber devices.

9. The method of selection of subscriber devices for joint dispatch wireless network 6, additionally contains the stages at which determine the bandwidth for subscriber devices, and if the combined throughput is less than the threshold, together subscriber devices.

10. The method of selection of subscriber devices for joint dispatch in a wireless network, according to claim 1 in which the bandwidth for each subscriber unit separately and throughput for each pair of the combined subscriber devices is calculated, the subscriber unit or a pair of devices, with the highest throughput, first.

11. Scheduler ascending line of communications to jointly subscriber devices on the wireless network, but the scheduler ascending line contains: entrance configured to make managing vector subscriber unit; comparison module configured to compare the control vectors of each pair of subscriber devices for determination of a coefficient of orthogonal vectors of governors; and the processor is configured to perform a joint dispatching of the first pair of subscriber devices for simultaneous transfer only if the corresponding factor of orthogonality is below the threshold.

12. Scheduler ascending line of communication to item 11, additionally includes the module selection of channels, configured to select a channel in which the change of the phase and amplitude of a transmitting in the frequency and temporal dimension is essentially agreed, and subscriber devices are selected device that can transmit data across the channel.

13. Scheduler ascending line of communication to item 11, where the joint dispatch of the first pair of devices is based on a modified ratio of orthogonal containing factor of orthogonality, multiplied by the highest SINR of SINR for each subscriber unit in the first couple of subscriber devices.

14. Scheduler ascending line of communication to paragraph 11, in which the processor is configured to: determine the throughput for subscriber devices; and if the bandwidth is combined subscriber devices is less than the threshold, joint dispatch of subscriber devices.

15. Scheduler ascending line of communication to paragraph 11, in which the processor is configured to: * calculate the bandwidth for each subscriber unit separately and bandwidth for each pair of the combined subscriber devices; and the choice of approach that maximizes throughput.

16. The base station to the joint dispatch of subscriber devices on the wireless network and base station includes: receiving device is configured to accept the filing of each subscriber devices and determine managing vector for each subscriber devices based on the respective transfer scheduler ascending line of communication, which includes module comparisons to compare the control vectors for each pair of devices to determine the ratio of orthogonal vectors of governors; and the processor is configured to perform a joint dispatching of the first pair of subscriber devices for simultaneous transfer only if the corresponding factor of orthogonality is below the threshold.

17. Machine-readable medium having stored on it computer programming logic to provide the opportunity for the scheduler ascending line: a. take the managing vector for each transmission of a subscriber unit in the receiver; b. compare control vectors of each pair of devices to determine the ratio of orthogonal vectors of governors; and c. perform joint dispatch of the first pair of subscriber devices for simultaneous transfer only if the corresponding factor of orthogonality is below the threshold.