WO2012028041A1

WO2012028041A1 - Method and device for notifying user group information, method and device for receiving a user group information

Info

Publication number: WO2012028041A1
Application number: PCT/CN2011/077267
Authority: WO
Inventors: 田开波; 孙波; 吕开颖; 姜静
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-02
Filing date: 2011-07-18
Publication date: 2012-03-08
Also published as: CN102387476A

Abstract

The present invention provides a method and a device for notifying a user group information, and a method and a device for receiving a user group information, thus reducing signaling overhead. The method includes: an access point sends group information to a station, and the group information carries group ID and identifier information of several stations in sequence, wherein, the position of the identifier of each station in the group information and the position of the station in the group corresponding to the group ID meet a preset mapping relationship.

Description

User group information notification method, receiving method and device

Technical field

The present invention relates to the field of communication between computer networks and wireless communications, and more particularly to a method and apparatus for notifying user packet information in IEEE 802.11ac, and a method and apparatus for receiving user packet information.

Background technique

Wireless Local Area Networks (WLAN) is a network system that uses wireless communication technology to interconnect computer devices to form a network that can communicate with each other and share resources. The essence of WLAN is that the communication cable is no longer used to connect the computer to the network, but is connected wirelessly, which makes the construction of the network and the movement of the terminal more flexible. IEEE802.i l is one of the mainstream technologies of wireless LAN. This protocol mainly specifies the physical layer (PHY) and media access control (MAC) layer specifications.

With the development of mobile communication technology and the increasing demand for wireless networks, the physical layer specification has been developing towards higher and higher speeds, going through 802.11 to 802.11b to 802.1 la/g, then 802.11η, now Has been to the development of 802.11ac. The actual physical technology has also evolved from direct sequence spread spectrum technology to OFDM (Orthogonal Frequency Division Multiplexing) technology, and introduced multi-antenna technology in IEEE802.11n, introducing large bandwidth and MU-MIMO in IEEE802.11ac (multiple User - multiple input and multiple output).

In the currently existing scheme, the method of notifying the user of the group information in MU-MIMO is mainly a group ID based notification scheme. The following is an example.

Assume that there are 1 AP and 10 STAs in the network, and 10 STAs are called A, B, C, D, E, F, G, H, I, J, respectively, and each STA uses its MAC address as an identifier. Each identifier occupies 12 bits, and each MU-MIMO packet can contain up to 4 users, that is, N _max — _m „=4, and the number of GroupIDs is 2.

First, the AP performs possible MU-MIMO packets according to the channel state information of 10 STAs, and has 14 groups: (ABCD), (ABGH), (CDEF), (CDIJ), (EFGH), (GHIJ), (CFGI) ) , ( DFHJ ) , ( DFHI ) , ( CFGJ ) , ( CEGI ) , ( DEHJ ) , (DEHI), (CEGJ). Note that the STAs in each parenthesis above have not been sorted.

Each group of MU-MIMO packets is assigned a GroupID. Since there are only two GroupIDs, each GroupID may need to indicate multiple packets. In order to effectively utilize the group information without confusion, the existing GroupID allocation principle is the same. Under GroupID, the relative position of the same STA in different groups is fixed. According to this principle, the STAs in each group need to be sorted and GroupID is assigned to each group. The ordering and allocation results are as follows:

Grouping under GroupID=l:

( ABCD ) , ( ABGH ) , ( EFCD ) , ( EFGH ) , ( IJCD ) , ( IJGH )

Grouping under GroupID=2:

( FICG ) , ( FJDH ) , ( FIDH ) , ( FJCG ) , ( EJDH ) , ( EJCG )

( EIDH ) , ( EICG )

According to the current scheme, the packet information publishing format can be seen in FIG. 1. The packet information follows the GroupID, and it is assumed that every 4 STAs are grouped, and under the same GroupID, the same STA is in different groups. The location is fixed. For example, under GroupID=l, A occupies the first position in the packet in both packets, and C exists in 3 packets, occupying the third in the group in each packet. Location, the STA sorting group in the above group is only one of the possibilities. For example, under GroupID=l, if the position of the above AB is reversed, the requirements are still met. The signaling overhead under this scenario is calculated as follows:

The overhead under GroupID=l is:

(Maximum number of STAs allowed per group) * (Number of bits occupied by each STA's MAC address) *

(Number of groups under GroupID=l) = 4*12*6=288bits=36 bytes

The overhead under GroupID=2 is:

(Maximum number of STAs allowed per group) * (Number of bits occupied by each STA's MAC address) * (Number of packets under GroupID=2) = 4* 12*8=384bits=48 bytes

The total packet information occupation overhead is 36+24=84 bytes.

In the existing solution, some solutions require less signaling overhead but less number of supported packets. Some schemes support more packets but require more signaling overhead. How to use less signaling overhead to notify As many multi-user grouping information as possible is a hot topic of current research. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and apparatus for notifying a user packet information, and a method and an apparatus for receiving user packet information, which reduce signaling overhead.

In order to solve the above problem, the present invention provides a packet information notification method, including: an access point sends packet information, where the packet information carries a group identifier and an identifier of a site that is sequentially arranged, where the identifier of the site The location of the location in the packet information and the location of the site in the packet corresponding to the group identity satisfy a preset mapping relationship.

Preferably, in the foregoing method, when an identifier of the same site appears more than one time in the group information, each station corresponding to the group identifier obtained by each location mapping that appears according to the site identifier is obtained. The location is the same.

Preferably, in the above method, the mapping relationship is:

The location number of the identifier of each station in the grouping information is a result of a modulo N _max — _m „ operation, which is the location of the station in the group corresponding to the group identifier, the N _max — _m „ The maximum number of sites allowed in each packet corresponding to the group identifier.

Preferably, in the foregoing method, the group information further includes a group identifier field and a location information field, where the group identifier field carries a group identifier, where the location information field includes N fields, and each of the N fields Including N _max subfields, among all the subfields included in the N fields, each subfield of the M subfields carries identifier information of one site, and the remaining N _max _ _m „ XN − M subfields carry virtual Identification information or identifier information of sites in M stations;

The number of the maximum number of sites allowed in each group under the group identifier is N, which is the number of fields required to represent the location information of the stations included in all the groups under the group identifier, and the M is the group. Identifies the number of different sites included in all groups.

Preferably, in the above method, the virtual identification information is access point address information or identifier information of a virtual site or a preset special symbol.

Preferably, in the above method, the access point is to send the group information to a station. The present invention also provides a packet information notification device in an access point, wherein the user packet information notification device is configured to: send packet information, and the packet information carries An identifier of the site with the group identifier and the sequentially arranged site, wherein the location of the identifier of the site in the packet information and the location of the site in the packet corresponding to the group identifier satisfy a preset mapping relationship.

Preferably, in the above apparatus, the grouping information satisfies: when an identifier of the same site appears more than one time in the grouping information, the site mapped by each location that appears according to the identifier of the site is The locations in the group corresponding to the group identifier are the same.

Preferably, in the foregoing apparatus, the mapping relationship is:

The location number of the identifier of each station in the grouping information is the result of the modulo N _max — _m „ operation, that is, the location of the station in the group corresponding to the group identifier, the N _max — _m „ The maximum number of sites allowed in each packet corresponding to the group identifier.

Preferably, in the above apparatus, the user group information notifying means is arranged to generate group information as follows:

The group information includes a group identifier field and a location information field, where the group identifier field carries a group identifier, the location information field includes N fields, and each of the N fields includes N _max — _m „ subfields In each of the subfields included in the N fields, each of the M subfields carries identifier information of a site, and the NXN-M subfields carry virtual identifier information or identifiers of sites in the M stations. The information is: n _max — _m „ is the maximum number of sites allowed in each group under the group identifier, and the N is a field required to represent location information of sites included in all groups under the group identifier Number, the M is the number of different sites included in all the groups under the group identifier.

Preferably, in the above apparatus, the virtual identification information is access point address information or identifier information of a virtual site or a preset special symbol.

Preferably, in the above apparatus, the user group information notifying means is configured to: send the group information to a station.

The present invention also provides a packet information receiving method, including:

After receiving the packet information, the site extracts a location of the site identifier that matches the self in the site identifier carried by the packet information in the packet information, and learns according to a preset mapping relationship. The location in the packet corresponding to the group identifier carried by the station in the packet information. Preferably, in the above method,

The step of obtaining the location of the site in the packet corresponding to the group identifier corresponding to the group information according to the preset mapping relationship includes:

The station performs a modulo N _max _ _m operation on the location of the packet information matching the self in the packet information, and the result is that the site is in the group corresponding to the group identifier. The location, the N _max _ _m „ is the maximum number of sites allowed in each packet corresponding to the group identifier.

The present invention also provides a packet information receiving apparatus in a station, wherein the user group information receiving apparatus is configured to: after receiving the grouping information, extract a site identifier carried by the grouping information and relate to itself The location of the matching site identifier in the grouping information is obtained according to a preset mapping relationship, and the location in the packet corresponding to the group identifier carried by the station in the grouping information is obtained.

Preferably, in the above apparatus, the user packet information receiving apparatus is configured to: perform a modulo operation on a location where the station identifier matching the self in the packet information is located in the group information, and the result is The location of the site in the packet corresponding to the group identifier, where N _max — _m „ is the maximum number of sites allowed in each packet corresponding to the group identifier.

Using the inventive method, all packet information can be advertised with less signaling overhead under a limited number of GroupID constraints; at the same time, the method can flexibly support the new STA to join the network to participate in the MU-MIMO packet, and can also发布 Publish new packet information with less signaling overhead;

BRIEF abstract

FIG. 1 is a schematic diagram of a format of existing group information publishing;

Figure ; ; , ^ , . "

2b is a schematic diagram of another packet distribution information format under the method provided by the embodiment of the present invention;

FIG. 2c is a schematic diagram of another packet distribution information format under the method provided by the embodiment of the present invention. Preferred embodiment of the invention

The following embodiments of the present invention are proposed based on the concept of GroupID (Group ID), which is a group number of a group of multiple STAs that can occupy the same time-frequency resource for transmission, and each group uses only one GroupID. Identification, but a GroupID can indicate different STA groups, and the number of GroupIDs is limited.

In a basic service set (BSS), an access point (AP) is based on one or more factors such as channel state information, data traffic, and data service type of each station (station, STA). The combination of factors, MU-MIMO packets are performed on the STAs associated with them, each packet contains a fixed number of STAs, assuming N _max — _m „, for a certain group, the number of STAs in the group is less than N _max In the case of ^, this packet is still considered to contain N _max _ _m „ STAs, N locations in each MU-MIMO packet, and the same STA appears in the same location in different packets with the same GroupID.

The STAs within each packet are arranged in a certain order. The order in which the STAs are arranged in the packet is determined by the principle that all possible packets can be assigned to one GroupID under the condition that the same STA appears in the same packet with different group IDs.

Each MU-MIMO packet is assigned a GroupID, and one GroupID may indicate one or more MU-MIMO packets; the same STA may appear in different MU-MIMO packets, and these MU-MIMO packets may have the same GroupID It can also have a different GroupID.

An embodiment of the present invention provides a method for notifying user group information, including:

The access point sends the group information to the station, where the group information carries the group identifier and the identifier information of the plurality of stations arranged in order, wherein the identifier of each station in the group information and the site The relative position in the group under the group identifier satisfies a preset mapping relationship.

Wherein, when the identifier of the same site appears in the grouping information more than once, the relative of the station mapped by each location that appears according to the site identifier in the group under the group identifier The location is the same.

Wherein one of the mapping relationships is: a bit of each station identifier in the grouping information Set the result of the modulo N _max — _m „ operation, that is, the relative position of the station in the group under the group identifier, the N _max _ _m „ is the maximum allowed site in each group under the group identifier Number. This is just an example, but it can also be based on other mappings.

The group information includes a group identifier field and a location information field, where the group identifier field carries a group identifier, where the location information field includes N fields, and each of the N fields includes _max — _m „ subfields Each of the M subfields in each field carries identifier information of a site, and N x N - M subfields carry virtual identifier information or identifier information of the site; the N _max _ _m „ is the group Identifying the maximum number of sites allowed in each packet, where N is the number of fields required to represent location information of sites included in all packets under the group identity, and the M is included in all packets under the group identity The number of different sites.

For example, each group under the same group of identifiers includes M=10 different sites, and the maximum number of sites allowed per group N _max —— ^ is 4, in order to represent the location information of 10 sites, N=3 fields are required. 4 x 3 = 12 subfields, where M=10 subfields carry identifier information of the station, and the remaining two subfields carry virtual identification information or site identifier information in the 10 stations, and the virtual identification information may be access The point address information may also be a virtual site identifier information, or a preset special symbol, such as ¥, and of course, other information, which is not limited in this embodiment, or may be empty.

The identifier of the site may be a MAC address of the site, or other information. The embodiment of the present invention further provides a method for receiving user group information. After receiving the group information, the station extracts a location of the site identifier in the station identifier carried by the group information, which is in accordance with the preset. The mapping relationship is obtained by the relative position of the group in the group under the group identifier carried in the group information.

According to the preset mapping relationship, the relative location of the group in the group under the group identifier corresponding to the group information includes:

The station calculates a location in which the site identifier matching the self in the grouping information is located, and the result is a relative position of the site in the group under the group identifier, where N is the The maximum number of sites allowed in each group under the group ID. Embodiment 1

As in the scenario in the background art, it is assumed that there are 1 AP and 10 STAs in the network, and the following grouping and sorting have been performed:

Grouping under GroupID=l:

( ABCD ) , ( ABGH ) , ( EFCD ) , ( EFGH ) , ( IJCD ) , ( IJGH )

Grouping under GroupID=2:

( FICG ) , ( FJDH ) , ( FIDH ) , ( FJCG ) , ( EJDH ) , ( EJCG ) ( EIDH ) , ( EICG )

According to the packet information notification method of the embodiment of the present invention, the packet information distribution format can be referred to FIG. 2a, 2b, and 2c. In the figure, the group information is immediately after the GroupID, and the relative position of a group is assumed every 4 spaces, 4 STAs filled in spaces do not indicate that the 4 STAs are assigned to a pair of locations.

For example, in the schematic diagram of Figure 2b GroupID=l, although the IBCD is arranged in 4 sets of spaces, in reality they are not a MU-MIMO packet, only the relative position in the group, that is, I is in the GroupID=l group. Will occupy the first position, such as the actual grouping (IJCD), (IJGH), B will occupy the second position in the GroupID=l group, such as the actual grouping (ABCD), (ABGH), and so on.

In Figure 2a and Figure 2b, the space marked by $ indicates that the STA that has no duplicates under this GroupID is filling this location, so this location is filled with a virtual STA MAC address, or filled with the AP address, or this GroupID The MAC address of any STA occupying this position fills this location. For example, as shown in Fig. 2c, G and D are padded to the 3rd space and the 4th space, respectively. Although the filling contents in the spaces in Fig. 2a, Fig. 2b, and Fig. 2c are different, the meanings are completely the same, and there are various schematic diagrams showing the same meaning, and are not enumerated here.

For example, ABCDEFGCHIJ¥ ¥ in Figure 2a, which means:

Where A is the first position of the grouping information, and the result of modulo 4 is 1, indicating that A will occupy the first position in the GroupID=l group.

B is the second position of the grouping information, and the result of modulo 4 is 2, indicating that B is in GroupID=l The second position will be in the group.

E is the fifth position of the grouping information, and its modulo 4 result is 1 , indicating that E will occupy the first position in the GroupID=l group. The rest are similar.

Under the solution of this embodiment, the signaling overhead of notifying the packet information is calculated as follows:

The overhead under GroupID=l is:

(Maximum number of STAs allowed per group) * (Number of bits occupied by each STA's MAC address) * (GroupID=l is the number of groups required to fully represent all STA location information) = 4*12*3=144bits = 18 bytes

The overhead under GroupID=2 is:

(GroupID=2 is the number of groups required to fully represent all STA location information) = 4*12*2=96bits=12 bytes

The total packet information occupation overhead is 18+12=30 bytes.

It can be seen that the method of the present embodiment can complete the issuance of all packet information with less signaling overhead.

Embodiment 2

After receiving the GroupID information sent by the AP, each STA parses the identifiers of all STAs included in the information, and matches each identifier with its own identifier. If a matching identifier is detected, it considers itself to belong. The one or more MU-MIMO packets under the GroupID obtain the location information of the matching identifier in the group information of the GroupID, and then perform the modulo 4 operation, and the operation result is the relative of the STA in the group under the GroupID. position.

For example, in FIG. 2c, after receiving the GroupID=1 information, the STA with the identifier E detects that the identifier included in the discovery information matches the identifier of the self, that is, it belongs to GroupID=l, and the matching identifier is in the GroupID. =l the first position of all the identifiers carried, so the result of 1 modulo 4 operation is 1, that is, the relative position of the MU-MIMO packet that is considered to be controlled by GroupID=1 is 1, specific, one The packet has 4 locations, and the STA identified as E is ranked in the first position in the packet; likewise, the STA with the identifier B receives the group information of GroupID=l. After detecting, the identifier included in the packet information is matched with the own identifier, that is, it belongs to GroupID=l, and the matching identifier is in the first and tenth of all the identifiers carried by GroupID=l. Position, using modulo 4 operations with 1 and 10 respectively, the result is 2, that is, the relative position of the STA with the identifier B in the MU-MIMO packet controlled by GroupID=1 is 2, specifically, one group has four Location, the STA identified as B is ranked in the second position in the group; and so on. With the method of the present embodiment, if the same identifier appears multiple times in the grouping information of one GroupID, the results of the modulo operations of the positions that occur multiple times are consistent.

The user group information notification device in the access point provided by the embodiment, the user group information notification device is configured to send group information to the station, where the group information carries a group identifier and several sites arranged in order The identifier information, wherein the location of the identifier of each site in the packet information and the relative location of the site in the packet under the group identity satisfy a preset mapping relationship.

The packet information satisfies: when an identifier of the same site appears in the packet information at least twice, the site mapped according to each location where the site identifier appears is under the group identifier The relative positions in the group are the same.

The mapping relationship is:

The location number of each station's identifier in the grouping information is the result of the modulo N _max ― ^ operation, that is, the relative position of the station in the group under the group identification, the N _max — _m „ The maximum number of sites allowed in each group under the group ID.

The user group information notification device generates the group information as follows: the group information includes a group identification field and a location information field, the group identification field carries a group identifier, and the location information field includes N fields, Each of the N fields includes N _max _ _m „ subfields, each of the M subfields in each field carries identifier information of one site, and NXN - M subfields carry virtual identifier information or an identifier of the site Information; the N _max ― _m „ is the maximum number of stations allowed in each group under the group identifier, and the N is the number of fields required to represent the location information of the stations included in all the groups under the group identifier The M is the number of different sites included in all the groups under the group identifier. The virtual identification information is access point address information or identifier information of a virtual site or a preset special symbol. The embodiment further provides a user group information receiving device in the station, and the user group information receiving device is configured to: after receiving the group information, extract a site identifier that matches the self in the station identifier carried by the group information. The location of the symbol, according to the preset mapping relationship, the relative position in the packet under the group identifier carried by the station in the group information is obtained.

The user group information receiving device is configured to perform a modulo N _max — _m „ operation on a location where the site identifier matching the self in the packet information is located, and the result is that the site is in the group identifier The relative position in the lower packet, the N _max — _m „ is the maximum number of stations allowed in each packet under the group identification.

The present embodiment further provides a user packet information notification system including the above-described user packet information notification device and receiving device.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial Applicability The present invention provides a user packet information notification method and apparatus, a user packet information receiving method and apparatus, and reduces signaling overhead. The method and the device can release all the packet information with less signaling overhead under a limited number of GroupID constraints; at the same time, the method can flexibly support the new STA to join the network to participate in the MU-MIMO packet. It is also possible to issue new packet information with less signaling overhead; this method can also flexibly support the exit network of the original STA.

Claims

Claim

1. A group information notification method, comprising:

The access point sends the group information, where the group information carries the group identifier and the identifier of the station in the order, wherein the identifier of the station in the group information corresponds to the station identifier in the group identifier The position in the grouping satisfies the preset mapping relationship.

2. The method according to claim 1, wherein, when an identifier of the same site appears more than one time in the grouping information, the site obtained by each location mapping according to the site identifier is in the The location in each group corresponding to the group identifier is the same.

3. The method according to claim 1, wherein the mapping relationship is:

The location number of the identifier of each site in the packet information is a result of a modulo N _max _ _m operation, which is a location of the site in a packet corresponding to the group identifier, the N _max — _m „ The maximum number of sites allowed in each packet corresponding to the group identifier.

The method according to claim 1, 2 or 3, wherein the group information further includes a group identification field and a location information field, the group identification field carries a group identifier, and the location information field includes N fields. Each of the N fields includes N _max — _m „ subfields, and among all subfields included in the N fields, each subfield of the M subfields carries identifier information of a site, The remaining N _max — _m „ x N − M subfields carry virtual identification information or identifier information of stations in M stations; the N _max — _m „ is the maximum number of sites allowed in each group under the group identifier The number of the N is the number of fields required to represent the location information of the station included in all the groups in the group identifier, and the M is the number of different sites included in all the groups under the group identifier.

The method according to claim 4, wherein the virtual identification information is access point address information or identifier information of a virtual site or a preset special symbol.

6. The method of any of claims 1-5, wherein the access point is to send the grouping information to a station.

7. A packet information notification device in an access point, wherein

The user group information notification device is configured to: send packet information, where the group information carries a group identifier and an identifier of the sequentially arranged site, wherein a location of the identifier of the site in the group information and the identifier The location of the site in the group corresponding to the group identifier satisfies a preset mapping Relationship.

8. The apparatus according to claim 7, wherein the grouping information satisfies: when an identifier of the same site appears more than one time in the grouping information, mapping each location that appears according to the identifier of the station The obtained stations are in the same location in the group corresponding to the group identifier.

9. The apparatus according to claim 7, wherein the mapping relationship is:

The apparatus according to claim 7, 8 or 9, wherein said user group information notifying means is arranged to generate group information as follows:

The group information includes a group identifier field and a location information field, where the group identifier field carries a group identifier, the location information field includes N fields, and each of the N fields includes m _ax — _m „ subfields In each of the subfields included in the N fields, each of the M subfields carries identifier information of a site, and the NXN-M subfields carry virtual identifier information or identifiers of sites in the M stations. The information is: n _max — _m „ is the maximum number of sites allowed in each group under the group identifier, and the N is a field required to represent location information of sites included in all groups under the group identifier Number, the M is the number of different sites included in all the groups under the group identifier.

The device according to claim 10, wherein the virtual identification information is access point address information or identifier information of a virtual site or a preset special symbol.

The apparatus according to any one of claims 7-11, wherein the user packet information notifying means is configured to: send the grouping information to a station.

13. A method for receiving packet information, comprising:

After receiving the packet information, the site extracts a location of the site identifier that matches the self in the site identifier carried by the packet information in the packet information, and learns according to a preset mapping relationship. The location in the packet corresponding to the group identifier carried by the station in the packet information.

14. The method of claim 13 wherein

Obtaining, according to a preset mapping relationship, a group identifier corresponding to the group information in the group information The steps of the location in the corresponding group include:

The station performs a modulo N _max — _m „ operation on a location of the packet information that matches the self in the packet information, and the result is that the site is in the group corresponding to the group identifier. The location, the N _max _ _m „ is the maximum number of sites allowed in each packet corresponding to the group identifier.

A packet information receiving apparatus in a station, wherein the user group information receiving apparatus is configured to: after receiving the group information, extract a station that matches a site identifier carried by the group information The location of the identifier in the packet information is obtained according to a preset mapping relationship, and the location of the packet in the packet corresponding to the group identifier carried in the packet information is obtained.

The user group information receiving apparatus according to claim 15, wherein the user group information receiving means is configured to: set a site identifier matching the self in the group information in the group information The position of the modulo N _max — _m „ operation, the result is the location of the station in the group corresponding to the group identifier, the N _max — _m „ is the maximum allowed in each group corresponding to the group identifier The number of sites.