Wireless access method, device, and system

• US 9,264,917 B2
• Filed: 12/13/2012
• Issued: 02/16/2016
• Est. Priority Date: 06/13/2010
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Sheng, Yu, Rongdao, Wu, Tao
• Primary Examiner(s): Appiah, Charles
• Assistant Examiner(s): Holliday, Jaime
• Application Number:
  US13/713,562
• Publication Number:
  US 20130102305A1
• Time in Patent Office: 1,160 Days
• Field of Search: 455/422.1, 455/507, 455/515, 455/517
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0046 Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 74/002 Transmission of channel access control information

Abstract

Embodiments of the present invention disclose a wireless access method, device, and system. The method includes: sending pilot signal strength or channel characteristics to a central processing node, where the pilot signal strength or channel characteristics are fed back by a user terminal within the coverage area of a wireless access node and are between the wireless access node and the corresponding user terminal; receiving access indication information of the user terminal, which is fed back by the central processing node and is determined according to the pilot signal strength or channel characteristics, where the access indication information of the user terminal includes an identifier of the wireless access node connected with the user terminal and a corresponding coding and modulation scheme; and sending the identifier of the wireless access node connected with the user terminal and the corresponding coding and modulation scheme to the corresponding user terminal.

Claims

1. A wireless access method, comprising:

sending by each respective wireless access node among a plurality of wireless access nodes which form a single cell coverage area, corresponding pilot signal strength or channel characteristics which are between the respective wireless access node and a corresponding user terminal within the single cell coverage area, to a central processing node within the single cell coverage area, such that the respective wireless node is being designated as a selected wireless access node to service a particular user terminal among a plurality of other user terminals within the single cell coverage area, wherein before the sending of the pilot signal strength or channel characteristics to the central processing node within the single cell coverage area, which the pilot signal strength or channel characteristics are between the wireless access node and the corresponding user terminal are fed back by the user terminal within the single cell coverage area of the wireless access node, the method comprises;

sending a pilot signal to the user terminal within the single cell coverage area by broadcast; and

receiving the pilot signal strength or channel characteristics, which are returned by the user terminal and are between the wireless access node and the corresponding user terminal within the single cell coverage;

or

receiving a pilot signal sent by the user terminal within the single cell coverage area by broadcast, and detecting the pilot signal strength or channel characteristics between the wireless access node and the corresponding user terminal, wherein;

the corresponding pilot signal strength or channel characteristics are fed back to the respective wireless access node by the corresponding user terminal within the single cell coverage area,

the respective wireless access node is selected by the central processing node within the single cell coverage area to connect with a particular user terminal based on the respective wireless access node receiving respective pilot signal strengths from all other plurality of user terminals within the single cell coverage area;

upon the respective wireless access node being selected, receiving by the selected wireless access node, access indication information of the particular user terminal fed back by the central processing node, wherein the access indication information of the particular user terminal is determined by the central processing node according to the received corresponding pilot signal strength or channel characteristics, wherein the access indication information of the particular user terminal comprises;

an identifier of the selected wireless access node connected with the particular user terminal within the single cell coverage area and a corresponding coding and modulation scheme for the particular user terminal; and

sending by the selected wireless access node, the identifier of the selected wireless access node connected with the particular user terminal and the corresponding coding and modulation scheme to the particular user terminal within the single cell coverage area.

2. A wireless access method, comprising a central processing node within a single cell coverage area, performing:

receiving pilot signal strength or channel characteristics sent by a wireless access node among a plurality of wireless access nodes which form a single cell coverage area, wherein the pilot signal strength or channel characteristics are between the wireless access node and the corresponding user terminal, are fed back by a user terminal within the single cell coverage area which are detected by the wireless access node, wherein the wireless access node connected with the user terminal is selected by the central processing node based on the respective pilot signal strength received from the other plurality of user terminals within the single cell coverage area;

determining access indication information of the user terminal according to the pilot signal strength or channel characteristics within the single cell coverage area, wherein the access indication information of the user terminal comprises;

an identifier of the selected wireless access node connected with the user terminal within the single cell coverage area and a corresponding coding and modulation scheme for the user terminal, wherein the determining of the access indication information of the user terminal according to the pilot signal strength or channel characteristics comprises;

determining, according to the pilot signal strength or the channel characteristics, interference strength of a signal sent by the wireless access node to the user terminal within the single cell coverage area; and

calculating a sum of interference strength to other user terminals than a target user terminal when each candidate wireless access node sends a signal to the target user terminal within the single cell coverage area, selecting a candidate wireless access node corresponding to a smallest value of the sum of interference strength as a target wireless access node which provides a downlink service for the target user terminal within the single cell coverage area, and determining an identifier of the target wireless access node and the corresponding coding and modulation scheme;

or

determining, according to the pilot signal strength or the channel characteristics, interference strength of a signal received by the wireless access node from the user terminal; and

when the target user terminal sends a signal to each candidate wireless access node within the single cell coverage area, calculating a sum of interference strength to other wireless access nodes than the candidate wireless access node within the single cell coverage area, selecting a candidate wireless access node within the single cell coverage area corresponding to a smallest value of the sum of interference strength as a target wireless access node which provides an uplink service for the target user terminal, and determining an identifier of the target wireless access node and the corresponding coding and modulation scheme; and

sending through the wireless access node, the identifier of the selected wireless access node connected with the user terminal within the single cell coverage area and the corresponding coding and modulation scheme to the corresponding user terminal.

3. A wireless access method, comprising by a user terminal within a single cell coverage area, performing:

receiving access indication information, which is returned through a wireless access node among a plurality of wireless access nodes which form the single cell coverage area, and the access indication information is determined by a central processing node within the single cell coverage area according to pilot signal strength or channel characteristics between the wireless access node and a corresponding user terminal within the single cell coverage area, wherein the access indication information comprises;

an identifier of the wireless access node connected with the user terminal and a corresponding coding and modulation scheme for the user terminal, wherein the wireless access node connected with the user terminal is selected by the central processing node within the single cell coverage area based on the respective pilot signal strength received from other plurality of user terminals,

wherein before the receiving of the access indication information which is returned by the wireless access node and is determined by the central processing node according to the pilot signal strength or channel characteristics between the home wireless access node and the corresponding user terminal within the single cell coverage area, the method comprises;

receiving a pilot signal sent by the home wireless access node by broadcast, and returning the pilot signal strength or channel characteristics between the wireless access node and the corresponding user terminal;

or

sending a pilot signal to the home wireless access node by broadcast, so that the wireless access node detects the pilot signal strength or signal characteristics between the wireless access node and the corresponding user terminal within the single cell coverage area according to the pilot signal; and

sending or receiving service data to or from the selected wireless access node corresponding to the identifier of the selected wireless access node according to the identifier of the selected wireless access node connected with the user terminal within the single cell coverage area and the corresponding coding and modulation scheme.

4. A wireless access node, the wireless access node being among a plurality of wireless access nodes which form a single cell coverage area, wherein the wireless access node comprising at least a processor which executes program codes, which configure the wireless access node to:

send pilot signal strength or channel characteristics to a central processing node within the single cell coverage area, where the pilot signal strength or channel characteristics are between the wireless access node and the corresponding user terminal, and the pilot signal strength or channel characteristics are fed back by a user terminal within the single cell coverage area of the wireless access node, wherein the wireless access node connected with the user terminal is selected by the central processing node based on the respective pilot signal strength received from other plurality of user terminals within the single cell coverage area;

send a pilot signal to the user terminal within the single cell coverage area by broadcast; and

receive the pilot signal strength or channel characteristics, which are returned by the user terminal and are between the wireless access node and the corresponding user terminal within the single cell coverage area;

or

receive a pilot signal sent by the user terminal within the single cell coverage area by broadcast; and

detect the pilot signal strength or channel characteristics between the wireless access node and the corresponding user terminal according to the pilot signal of the user terminal within the single cell coverage area;

receive access indication information of the user terminal, which is fed back by the central processing node within the single cell coverage area, and the received access indication information of the user terminal is determined according to the pilot signal strength or channel characteristics, wherein the access indication information of the user terminal comprises;

an identifier of the selected wireless access node connected with the user terminal within the single cell coverage area and a corresponding coding and modulation scheme for the user terminal; and

send the identifier of the selected wireless access node connected with the user terminal and the corresponding coding and modulation scheme to the corresponding user terminal within the single cell coverage area.

5. A central processing node within a single cell coverage area, comprising at least a processor which executes program codes, which configure the central processing node to:

receive a respective pilot signal strength or channel characteristics sent by a plurality of wireless access nodes within the single cell coverage area, wherein the respective pilot signal strength or channel characteristics are received from a plurality of user terminals within the single cell coverage area of each of the plurality of wireless access nodes;

determine access indication information of one particular user terminal out of the plurality of user terminals within the single cell coverage area according to the pilot signal strength or the channel characteristics, wherein the access indication information of the one particular user terminal comprises;

an identifier of the wireless access node connected with the one particular user terminal within the single cell coverage area and a corresponding coding and modulation scheme for the one particular user terminal;

select one of the plurality of wireless access nodes for communicating data with the one particular user terminal within the single cell coverage area, wherein the selecting of the wireless access nodes is based on the respective pilot signal strength received from other plurality of user terminals within the single cell coverage area;

determine a respective sum of the respective pilot signal strength received from each of the plurality of access nodes within the single cell coverage area, and to select a one of the plurality of access nodes corresponding to the smallest determined respective sum; and

send the identifier of the selected wireless access node connected with the one particular user terminal within the single cell coverage area and the corresponding coding and modulation scheme to the corresponding one particular user terminal through the selected wireless access node.

6. A method for selecting an access node from a plurality of access nodes within a single cell coverage area for communicating service data with one particular user equipment out of a plurality of user equipment within the single cell coverage area, the method comprising:

based on respective interference signal strengths measured by the selected access node on each of the other plurality of user equipment within the single cell coverage area, wherein the respective interference signal strengths are measured based on communication between the one particular user equipment and each of the plurality of access nodes within the single cell coverage area,

selecting an access node that produces the smallest sum of interference signal strengths measured from all the other plurality of user equipment while the selected access node communicating service data with the one particular user equipment within the single cell coverage area;

wherein the selecting of the access node is in response to receiving a respective interference signal strength for each of the other user equipment from each of the plurality of access nodes within the single cell coverage area,

wherein the selecting of the access node is in response to receiving a respective interference signal strength for each of the other user equipment from each of the plurality of access nodes within the single cell coverage area comprises;

determining a respective sum of the interference signal strengths received from each of the plurality of access nodes within the single cell coverage area; and

selecting the one of the plurality of access nodes within the single cell coverage area corresponding to the smallest determined respective sum.

7. The method of claim 6 further comprises communicating to the UE an identifier corresponding to the identified one of the plurality of access nodes within the single cell coverage area.

8. A method for selecting an access node from a plurality of access nodes within a single cell coverage area, wherein the selected access node is for communicating with a particular one user equipment out of a plurality of user equipment within the single cell coverage area, the method comprising a central processing node within the single cell coverage area, performing:

receiving from each of the plurality of access nodes a respective interference signal strength from all other plurality of user equipment within the single cell coverage area, wherein the respective interference signal strength are measured by each of the plurality of access nodes based on data communication between the plurality of access nodes and all other plurality of user equipment within the single cell coverage area;

determining a respective sum of the respective interference signal strengths received from each of the plurality of access nodes within the single cell coverage area;

identifying one out of the plurality of access nodes within the single cell coverage area having the smallest determined respective sum of the respective interference signal strengths being the selected access node, and;

selecting the identified selected access node for communicating with the particular user equipment within the single cell coverage area.

9. A system for selecting an access node within a single cell coverage area for communicating service data with one particular user terminal out of a plurality of user terminals within a single cell coverage area, the system comprising:

a central processing node; and

a plurality of wireless access nodes coupled to the plurality of user terminals including the one particular user terminal within the single cell coverage area,

wherein the central processing node within the single cell coverage area is configured to;

receive from each of the plurality of access nodes a respective interference signal strength from all the other plurality of user terminals within the single cell coverage area, wherein the respective interference signal strength are measured by each of the plurality of access nodes based on data communication between the plurality of access nodes and all other plurality of user equipment within the single cell coverage area,

determine a respective sum of the respective interference signal strengths received from each of the plurality of access nodes within the single cell coverage area,

identify one out of the plurality of access nodes having the smallest determined respective sum of the respective interference signal strengths being a selected access node within the single cell coverage area, and

select the identified selected access node for communicating with the one particular user equipment within the single cell coverage area.