Method of compressing control information in wireless communicatons systems

FIELD: communications systems.

SUBSTANCE: proposal is given of a method of compressing control information for an up-link in a wireless communication system, where a mobile user station scans neighboring base stations upon request by a service base station and sends information on the neighboring base stations to the service base station. In this method, the service base station sends a message with notice of neighboring base stations, which includes an identifier, of at least one neighboring base station, about which the service station intends to obtain information and an identifier of the above mentioned neighboring base station. The mobile user station then scans the channel, transmitted by at least one neighboring base station, and sends the scanning result together with the index of that neighboring base station to the service base station.

EFFECT: reduced unproductive expenses.

13 cl, 4 dwg, 1 tbl

 

The technical field

The present invention generally relates to the management of resources in a wireless communication system, in particular to a method for reducing overhead when transmitting the control message to the upward channel with the aim of increasing the efficiency of resource use in a wireless communications system.

The level of technology

Usually in a cellular wireless communications system to facilitate the initial connection to the network and perform transmission maintenance mobile subscriber station (MSS) gathers information about the neighbor base stations (BS). For this purpose, the serving base station periodically wirelessly transmits the request message channel information, to collect information about the channels from the neighboring base stations. When receiving a request message information of the mobile subscriber station scans the channels transmitted by neighboring base stations, and transmits a message with information about the channel, belonging to the neighboring base stations, the serving base station.

To exchange information about neighboring base stations of the serving base station and the mobile subscriber station to identify the neighbouring base station specific global identifiers (ID). Therefore, control messages, such as request message information the AI channel and a message channel, include globally unique identifiers denoting the neighboring base station.

For example, in the system of standard a, developed by the Institute of engineers on electrical and electronics (IEEE), the serving base station transmits the information about the neighbor base stations in the message containing the Declaration of the neighboring base stations, to help mobile subscriber stations to choose the best cell (cell). The mentioned message includes a globally unique identifiers denoting the neighboring base station. Mobile subscriber station scans the channels of the neighboring base stations on the basis of the message that contains the Declaration of the neighboring base stations, and transmits the results of the scan channels serving base station in communication with the report for the bullish channel. In addition, the mobile subscriber station uses a global identifier to notify the serving base station to the new base station to which the mobile subscriber station will be performed during the transfer of service.

However, as global identifiers are fairly long, the transfer of all global identifiers in the message with the report for the bullish channel causes significant overhead.

In addition, neighboring base stations are in most cases already izvestnyakovye base station and mobile subscriber stations, because the transfer occurs within a group of neighboring base stations, and information about this group periodically airing in the message containing the Declaration of the neighboring base stations. Accordingly, there is a need to reduce overheads attributable to the transfer of such global identifier.

The invention

The present invention is the actual solution, at least the above problems and/or eliminate disadvantages and provide at least the following advantages. Accordingly, the present invention is to provide a method of compression of information management to reduce overhead when transferring from bottom-up channels by compressing the global identifiers denoting the neighboring base station is in communication with the report for the bullish channel.

Another objective of the present invention is to provide a method for compression of information management to increase resource efficiency by reducing overhead when transferring from bottom-up channels.

Meet the above-mentioned objectives are achieved by offering compression method control information for the upward channel in a wireless communication system where a mobile subscriber with whom anzia scans the neighboring base station upon request of a serving base station and transmits the station information about neighboring base stations.

In this way the mobile subscriber station compresses the global ID of the neighboring base stations and transmits the information about the neighboring base stations together with the compressed global identifiers serving base station.

At the stage of compression of the serving base station broadcasts a message containing the announcement of the neighboring base stations, which includes an identifier of at least one neighboring base station, which serves the station wants to receive information, and the index of the base station corresponding to said identifier. After which the mobile subscriber station scans the channel of said at least one neighboring base station, and transmits the above-mentioned index of this at least one neighboring base station together with the scan of a serving base station.

Serving base station stores a lookup table in which the global IDs of the neighboring base stations is set in accordance with the indices of these stations. The message with the announcement of the neighboring base stations includes a counter configuration changes, indicating the time when the transmitted mentioned message, which indicates the frame number for the message with the announcement of the neighboring base stations. The response message for the message is Oia, contains the Declaration of the neighboring base stations includes a counter configuration changes for the above message.

In the preferred case, the index of the base station is a loop counter that indicates the position of the global ID of the mentioned at least one neighboring base station, and this index is generated by combining said count cycle for the above-mentioned at least one neighboring base station and meter configuration changes.

The index of the base station can also be created by combining the loop counter for the said at least one neighboring base station and the frame number for the message with the announcement of the neighboring base stations.

Brief description of drawings

The above and other objectives, features and advantages of the present invention will become more apparent from the following detailed description when viewed together with the accompanying drawings, in which:

figure 1 - diagram illustrating the basic structure of the message containing the Declaration of the neighboring base stations, in relation to the compression method control information corresponding to the preferred implementation variant of the present invention;

2 is a diagram illustrating the structure of the control message for rising to the Nala, applies a compression method control information corresponding to the preferred implementation variant of the present invention;

figure 3 shows the message MOB-NBR-ADV, which is used in the description of the compression method control information corresponding to the preferred implementation variant of the present invention; and

figure 4 shows the message MOB-SCAN-REPORT, which the mobile subscriber station transmits the base station as a response to the message MOB-NBR-ADV shown in figure 3.

A detailed description of the preferred embodiments

Below with reference to the accompanying drawings described a preferred embodiment of the present invention. In the description below, a well-known functions or constructions are not considered in detail, as this would lead to difficulties in understanding the present invention because of the optional parts.

According to the IEEE 802.16 mobile subscriber station uses to identify the neighbouring base stations 48-bit address control the medium access (MAC address), when the result of the scanning of a serving base station using message MOB-SCAN-REPORT. However, in the present invention instead of the 48-bit MAC address is used 8-bit index of the neighboring base station if all the neighboring base the e station in the message MOB-SCAN-REPORT are members of the list of neighbor base stations, contained in the message MOB-NBR-ADV. In this case, the 8-bit index of the neighboring base station indicates the position of the neighboring base station in the above list.

Figure 1 is a diagram illustrating the basic structure of the message containing the Declaration of the neighboring base stations, in relation to the compression method control information corresponding to the preferred implementation variant of the present invention. The message with the announcement of the neighboring base stations includes field 11 N_NEIGHBORS indicating the number of neighboring base stations, the global identifiers 13-1 to 13-n, representing the unique MAC addresses of neighboring base stations, and indexes NBR BS representing the indices of the neighboring base stations associated MAC addresses. To support the implementation of the compression method control information corresponding to the present invention, the serving base station stores a lookup table in which MAC addresses of neighboring base stations is set in accordance with the indices of these stations.

Figure 2 is a diagram illustrating the structure of the control message for the ascending channel that applies a compression method control information corresponding to the preferred implementation variant of the present invention. As shown in figure 2, omanyte message includes a field 21 ID used NBR_ADV", indicates the frame number, which is airing the message MOB-NBR-ADV, indexes NBR BS 23-1 to 23-n as identifiers of neighboring base stations in the message MOB-NBR-ADV field 22 N_BS_index indicating the number of indexes NBR BS. Because the message MOB-NBR-ADV periodically transmitted to a serving base station, the mobile subscriber station must explicitly set the field 21 ID used NBR_ADV relating to the message MOB-NBR-ADV, in the control message for the bullish channel.

Figure 3 shows the structure of a message MOB-NBR-ADV, which is used in the description of the compression method control information corresponding to the preferred implementation variant of the present invention.

As shown in figure 3, the message MOB-NBR-ADV broadcast serving base station, includes a 24-bit field 31 "operator ID", field 32 "Counter configuration changes that specifies the instance of the current message MOB-NBR-ADV, box 33 N_NEIGHBORS indicating the number of neighboring base stations included in the message MOB-NBR-ADV, and the list of 35 base stations, which lists the latest (valid) identifiers of the neighboring base stations.

In the depicted case, the "operator ID" equal 000ecdf, "Counter configuration changes" is 33 and N_NEIGHBORS is 10.

In the list of base station identifiers with the first 35-1 what about the tenth 35-10 base station is set as NBR_BS_ID=h, NBR_BS_ID=h, NBR_BS_ID=h, NBR_BS_ID=h, NBR_BS_ID=h, NBR_BS_ID=h, NBR_BS_ID=043d254, NBR_BS_ID=056266f, NBR_BS_ID=08da09d and NBR_BS_ID=has, in the specified order.

Each of these identifiers of base stations with 35-1 on 35-10 has a length of 24 bits. 24-bit identifier and a 24-bit field 31 "operator ID" form a 48-bit global identifier, namely the MAC ID.

Serving base station transmits the indices of the neighboring base stations, indicating their position in the list of 35 base stations message MOB-NBR-ADV, namely counters cycle "j", together with the identifiers of the base stations, and stores a lookup table in which identifiers of base stations from the list corresponds to the indices of the neighboring base stations. The result is:

j=0: NBR_BS_ID=h (35-1)

j=1: NBR_BS_ID=h (35-2)

j=2: NBR_BS_ID=h (35-3)

j=3: NBR_BS_ID=h (35-4)

j=4: NBR_BS_ID=h (35-5)

j=5: NBR_BS_ID=h (35-6)

j=6: NBR_BS_ID=043d254 (35-7)

j=7: NBR_BS_ID=056266f (35-8)

j=8: NBR_BS_ID=08da09d (35-9)

j=9: NBR_BS_ID=has (35-10)

When you receive a message MOB-NBR-ADV from the serving base station of the mobile subscriber station stores the lookup table, scans the channels from the neighboring base stations and reports the result of scanning the servicing base station.

Figure 4 shows the message MOB-SCAN-REPORT, which the mobile subscriber station transmits the service the soup base station in response to message MOB-NBR-ADV, shown in figure 3. Message MOB-NBR-ADV broadcast periodically, and the neighboring base stations listed in the list of base stations of this message may vary due to changes in network topology or communication media. Therefore, the message MOB-SCAN-REPORT should be turned Counter configuration changes to use the indices of the neighboring base stations instead of their MAC addresses.

As shown in figure 4, the message MOB-SCAN-REPORT includes field 41 "Counter configuration changes, indicating the message MOB-NBR-ADV referenced by a mobile subscriber station, box 42 N_NEIGHBORS indicating the number of neighboring base stations installed in message MOB-NBR-ADV, and a list of 45 index base stations, which lists the indices of the neighboring base stations corresponding to the global ID of the scanned neighboring base stations.

In the shown case, the Counter configuration changes" is 33 and is equal to the count in the message MOB-NBR-ADV, and N_NEIGHBORS is 4.

A list of 45 index base stations has indexes scanned the neighboring base stations 45-1 through 45-4 corresponding to the loop indices "j", set in the message MOB-NBR-ADV.

These indexes of the neighboring base stations are set as follows: NBR_BS_INDEX=5, NBR_BS_INDEX=3, NBR_BS_INDEX=8 and NBR_BS_INDEX=0, in the specified order.

When you receive a message MOB-SCAN-REPORT from the mobile subscriber is coy station serving base station selects a suitable lookup table, based on the fact that "Counter configuration changes" is 33, and determines the neighboring base station based on the index of base stations installed in message MOB-SCAN-REPORT.

NBR_BS_INDEX=5, NBR_BS_INDEX=3, NBR_BS_INDEX=8 and NBR_BS_INDEX=0 set in the message MOB-SCAN-REPORT, are in accordance with the following relevant global identifiers of base stations:

NBR_BS_INDEX=5: NBR_BS_ID=0x00ecdf844325

NBR_BS_INDEX=3: NBR_BS_ID=0x00ecdf543543

NBR_BS_INDEX=8: NBR_BS_ID=0x00ecdf8da09d

NBR_BS_INDEX=0: NBR_BS_ID=0x00ecdf000123

This replacement NBR_BS_ID index NBR_BS_INDEX in the control message for the bullish channel reduces the number of bits, which is calculated according to equation 1:

SB=(length NBR_BS_ID - length NBR_BS_INDEX)×N_BS_INDEX - Spin configuration changes(1),

where N_BS_INDEX equivalent N_NEIGHBORS in message MOB-SCAN-REPORT.

In the example above, is illustrated in figure 3 and 4, the number of saved bits is (48-8)×10-8=392 bits.

The following table shows the number of saved bits for the index N_BS_INDEX when using the compression method of the control message for the bullish channel, proposed by the present invention.

td align="center"> 32
Table
N_BS_INDEX123456
The number of saved bits72112152192232

Although the preferred implementation variant of the present invention that this invention is not limited to, a compression method of the control message for the ascending channel that uses the index NBR_BS_INDEX, applied to the message MOB-SCAN-REPORT, this method is applicable to any other control message, such as message MOB-MSSHO-REQ, used for the transfer initiated by the mobile subscriber station.

As described above, the compression method information management for the ascending channel that corresponds to the present invention, compresses the long addresses of base stations exchange information about the neighbor base stations between the base station and the mobile subscriber station. The result is saved radioresource. This compression control information for the bullish channel increases the efficiency of resource use and, hence, the capacity of the system.

Although the present invention is shown and described with reference to specific preferred implementation, specialists in the art will understand that can be made various changes in form and details that do not fall within the essence and scope of the present invention, certain items of the attached claims.

1. The compression method information management for the upward channel in a wireless communication system where a mobile subscriber station (MSS) scans the neighboring base station (BS) on request from the serving base station and transmits information about the neighboring base stations of the serving base station, and the method comprises the following steps:

compress the identifiers (ID) of a base station of the neighboring base stations using the mobile subscriber station; and

transmit the information about the neighboring base stations together with the compressed identifiers of base stations to the serving base station using the mobile subscriber station.

2. The method according to claim 1 in which the said step of compressing includes the following steps:

transmit using the service base station, the message including the announcement of the neighboring base stations, which includes the identifier of the base station, at least one neighboring base station, which serves the base station wants to receive information, and the index of the base station corresponding to said identifier of the base station;

scan channel transmitted mentioned at least one neighboring base station; and

transmit the above-mentioned index of the base stations of this, at least, one of the Oh neighboring base station together with the scanning result to the serving base station using the mobile subscriber station.

3. The method according to claim 2, in which the said index of the base station is a loop counter that indicates the position of the identifier of the base station mentioned at least one neighboring base station.

4. The method according to claim 2, in which the serving base station stores a lookup table in which identifiers of base stations neighboring base stations are assigned to the indexes of the base stations of the base stations.

5. The method according to claim 2, in which the said message with the announcement of the neighboring base stations includes a counter configuration changes, indicating the time when the transmitted mentioned message.

6. The method according to claim 5 in which the said counter configuration changes indicates the frame number for the message with the announcement of the neighboring base stations.

7. The method according to claim 5, in which the response message for the message with the announcement of the neighboring base stations includes a counter configuration changes for the above message.

8. The method according to claim 5 in which the said index, the base station creates by combining the loop counter indicating the position of the identifier of the base station mentioned at least one neighboring base station, and counter configuration changes.

9. The method of claim 8 in which the said index base station presented the Yong mentioned counter configuration changes and the loop counter.

10. The method according to claim 8, in which the most significant bits (MSB) index base stations are counter configuration changes, and the least significant bits (LSB) index base stations represent a loop counter.

11. The method according to claim 2, in which the said index, the base station creates by combining the loop counter indicating the position of the identifier of the base station mentioned at least one neighboring base station, and the frame number for the message with the announcement of the neighboring base stations.

12. The method according to claim 11, in which the said index base stations are referred to by the frame number for the message with the announcement of the neighboring base stations and the loop counter.

13. The method according to claim 11, in which the most significant bits of the index base stations represent a frame number for a message with the announcement of the neighboring base stations, and the least significant bits of the index base stations represent a loop counter.



 

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