Data Transmission Scheduling Method, Device and System

Patent metadata

Field	Value
Publication number	US-2016249351-A1
Application number	US-201415021004-A
Country	US
Kind code	A1
Filing date	Jun 3, 2014
Priority date	Sep 11, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

A data transmission scheduling method, device and system are disclosed, which relates to the field of wireless communications, and solves the problem of low network utilization rate in the related scheduling modes. The method includes: receiving a measurement report sent by an access point (AP), wherein the measurement report carries a transmission power of the AP sending the measurement report, and signal reception levels and powers of surrounding devices of the AP; according to the measurement report, evaluating interference relationships between the AP and the surrounding devices of the AP, and obtaining an evaluation result; and making a scheduling decision according to the evaluation result. The technical scheme provided in the embodiments of the present document is applicable to a WLAN, which implements parallel communication of a plurality of low-interference terminals.

First claim

1 . A data transmission scheduling method, comprising:
receiving a measurement report sent by an access point (AP), wherein the measurement report carries a transmission power of the AP sending the measurement report, and signal reception levels and powers of surrounding devices of the AP; evaluating interference relationships between the AP and the surrounding devices of the AP according to the measurement report, and obtaining an evaluation result; and making a scheduling decision according to the evaluation result.

2 . The data transmission scheduling method according to claim 1 , wherein, the step of evaluating interference relationships between the AP and the surrounding devices of the AP according to the measurement report comprises:
according to the measurement report, calculating path loss data between the APs; establishing path loss data between an AP and a client accessing under the AP; and evaluating interference relationships between all devices in one communication pair and all devices in another communication pair according to the path loss data between the APs and the path loss data between the AP and the client accessing under the AP;
wherein, the communication pair is composed of communications between the AP and the client accessing under the AP.

3 . The data transmission scheduling method according to claim 2 , wherein, when only two communication pairs exist, a first AP and a first client form one communication pair, a second AP and a second client form the other communication pair, the step of evaluating interference relationships between all devices in one communication pair and all devices in another communication pair according to the path loss data between the APs and the path loss data between the AP and the client accessing under the AP comprises:
calculating an interference value RSSI_aa12 from the first AP to the second AP according to an expression below: RSSI_aa12=TxPower AP 1 −PathLoss AP 1 AP 2 , wherein, TxPower AP 1 is a transmission power of the first AP, and PathLoss AP 1 AP 2 is path loss data between the first AP and the second AP; calculating an interference value RSSI_as12 from the first AP to the second client according to an expression below: RSSI_as12=TxPower AP 1 −PathLoss AP 1 STA 2 , wherein, PathLoss AP 1 STA 2 is path loss data between the first AP and the second client; calculating an interference value RSSI_sa12 from the first client to the second AP according to an expression below: RSSI_sa12=TxPower STA1 −PathLOSS AP 2 STA 1 , wherein, TxPower STA 1 is a transmission power of the first client, PathLoss AP 2 STA 1 is path loss between the second AP and the first client; comparing the RSSI_aa12, RSSI_as12 and RSSI_sa12 with a threshold value when interfered preset for the second AP and the second client; and when the RSSI_aa12, RSSI_as12 and/or the RSSI_sa12 exceeds the threshold value when interfered, determining that an interference exists.

4 . The data transmission scheduling method according to claim 2 , wherein, when three or more than three communication pairs exist, a first AP and a first client form a first communication pair, the step of evaluating interference relationships between all devices in one communication pair and all devices in another communication pair according to the path loss data between the APs and the path loss data between the AP and the client accessing under the AP comprises:
respectively evaluating interference relationships between various communication pairs containing a neighboring AP of the first AP and the first communication pair; and performing accumulation on the interference relationships of the various communication pairs containing the neighboring AP with the first communication pair, and obtaining a total interference of all communication pairs containing the neighboring AP with the first communication pair.

5 . The data transmission scheduling method according to claim 3 , wherein, the step of making a scheduling decision according to the evaluation result comprises:
when two communication pairs request for simultaneously transmitting downlink data packets, judging whether the following four conditions are met, when the following four conditions are simultaneously met, determining that the two communication pairs can simultaneously transmit the downlink data packets: when the first AP sends data to the first client, the second AP and the second client cannot interfere with the first client; when the second AP and the second client interfere with the first AP, the interference is stopped before the first client sends downlink data ACK; when the second AP sends data to the second client, the first AP and the first client cannot interfere with the second client; and when the first AP and the first client interfere with the second AP, the interference is stopped before the second client sends the ACK.

6 . The data transmission scheduling method according to claim 4 , wherein, the step of making a scheduling decision according to the evaluation result comprises:
when three or more than three communication pairs request for simultaneously transmitting downlink data packets, judging whether the following two conditions are met, when the following two conditions are simultaneously met, determining that the three or more than three communication pairs can simultaneously transmit the downlink data packets: an interference of any communication pair with another communication pair is less than a set threshold; and an interference with any communication pair is less than a set threshold.

7 . The data transmission scheduling method according to claim 1 , wherein, the step of making a scheduling decision according to the evaluation result comprises:
dividing time resource of a time interval of a management frame Beacon frame of at least one AP into a plurality of time slices; orderly allocating different time slices for each AP according to a sequence from large to small of sums of interferences from each AP with other APs and interferences from other APs with each AP, not allocating a same time slice to APs between which the interference exists, and allocating a plurality of APs between which no interference exists in a same time slice.

8 . The data transmission scheduling method according to claim 7 , wherein, when time slices are allocated to the APs between which the interference exists, time slices are preferentially allocated to an AP with a higher priority.

9 . The data transmission scheduling method according to claim 8 , further comprising:
configuring a priority for each AP in a network.

10 . The data transmission scheduling method according to claim 7 , wherein after the step of making a scheduling decision according to the evaluation result, the method further comprises:
outputting scheduling decision information, wherein the scheduling decision information contains bitmap information of time slices of each AP, indicating each AP to compete for a channel in allocated time slices, and after the channel is obtained by competition, filling downlink data into a buffer of a physical layer.

11 . The data transmission scheduling method according to claim 1 , wherein, the step of making a scheduling decision according to the evaluation result comprises:
dividing time resource of a time interval of a Beacon frame of at least one AP into a plurality of time slices; each AP allocating n/M time slices for each associated client under the AP, wherein a principle for allocating the time slices comprises: the client being a client with a minimum sum of an inter

Assignees

• Zte Corp

Inventors

• Wang Bo
• Huang He

Classifications

• H04W72/542

  using measured or perceived quality · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W4/06 Primary

  Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services · CPC title

• H04W72/541

  using the level of interference · CPC title

• H04W24/10 Primary

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title