Method and apparatus for handling full-duplex interference

• US 8,913,528 B2
• Filed: 09/18/2012
• Issued: 12/16/2014
• Est. Priority Date: 01/16/2012
• 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: Cheng, Hong, Liu, Sheng, Du, Yinggang, Wang, Rui
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): AGA, SORI A
• Application Number:
  US13/622,292
• Publication Number:
  US 20130194984A1
• Time in Patent Office: 819 Days
• Field of Search: None
• US Class Current: 370/278
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio 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: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

The present invention provides a method and an apparatus for handling full-duplex interference. One method includes: obtaining an interference degree that is caused when a site device performs full-duplex transmission with at least two UEs; and determining, according to the interference degree, a UE allowed to transmit uplink and downlink signals on the same time and frequency resource among the at least two UEs. In embodiments of the present invention, a UE allowed to transmit uplink and downlink signals on the same time and frequency resource may be classified according to an interference degree that is caused when a site device performs full-duplex transmission with at least two UEs, thereby preventing the interference problem in the scenario of point-to-multipoint full-duplex communication as much as possible.

Claims

1. A method for handling full-duplex interference, the method comprising:

obtaining an interference degree that is caused when a site device performs full-duplex transmission with at least two User Equipment (UEs), wherein obtaining an interference degree comprises,

obtaining a degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission, and

obtaining a degree of self-interference of a transmit signal on a received signal of the site device during full-duplex transmission, wherein obtaining a degree of self-interference comprises,

obtaining power information of self-interference of the transmit signal on the received signal, and

obtaining, according to the power information of self-interference and power information of the received signal, a degree of difference between self-interference power and received signal power, and determining, according to the degree of difference, a degree of self-interference; and

determining, according to the interference degree, UEs allowed to transmit uplink and downlink signals with the site device on a same time and frequency resource among the at least two UEs;

wherein one or more UEs that are determined to transmit uplink signals and one or more UEs that are determined to transmit downlink signals on the same time and frequency resource are classified as having a low interference degree.

2. The method according to claim 1, wherein obtaining a degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission comprises:

obtaining position related information of the at least two UEs; and

obtaining, according to the position related information, the degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission.

3. The method according to claim 2, wherein obtaining position related information of the at least two UEs comprises:

receiving position information of the at least two UEs sent by the at least two UEs; and

obtaining, according to the position related information, a degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission comprises;

determining, according to the position information of the at least two UEs, a relative distance between the at least two UEs; and

determining, according to the relative distance, the degree of mutual interference, wherein the shorter the relative distance is, the higher the degree of mutual interference is.

4. The method according to claim 2, wherein obtaining position related information of the at least two UEs comprises:

receiving uplink signals sent by the at least two UEs; and

obtaining, according to the position related information, a degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission comprises;

determining, according to the uplink signals, the position information of the at least two UEs;

determining, according to the position information of the at least two UEs, a relative distance between the at least two UEs; and

determining, according to the relative distance, the degree of mutual interference, wherein the shorter the relative distance is, the higher the degree of mutual interference is.

5. The method according to claim 3, further comprising:

sending position information of a UE at the edge of a cell among the at least two UEs to a neighboring site device, so that the neighboring site device obtains, according to the position information of the UE that is received, the degree of mutual interference.

6. The method according to claim 2, wherein obtaining position related information of the at least two UEs comprises:

receiving short-distance communication equipment identities sent by the at least two UEs, wherein a short-distance communication equipment identity is an equipment identity of a UE allowed to performing short-distance communication; and

obtaining, according to the position related information, a degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission comprises;

determining, according to the short-distance communication equipment identities, that mutual interference exists between a UE which reports the short-distance communication equipment identity and the UE which the short-distance communication equipment identity belongs to.

7. The method according to claim 6, further comprising:

if it is determined, according to the short-distance communication equipment identities, that a UE corresponding to the short-distance communication equipment identity does not belong to a current cell, sending the short-distance communication equipment identity to a neighboring site device, so that the neighboring site device obtains, according to the received short-distance communication equipment identity, the degree of mutual interference.

8. The method according to claim 1, wherein determining, according to the interference degree, UEs allowed to transmit uplink and downlink signals with the site device on a same time and frequency resource among the at least two UEs comprises:

determining, according to the interference degree, one or more UEs transmitting uplink signals and one or more UEs receiving downlink signals on a same time and frequency resource unit among the at least two UEs;

or,

determining, according to the interference degree, one or more UEs transmitting uplink signals and one or more UEs receiving downlink signals among the at least two UEs, and then determining a time and frequency resource unit configured to transmit the uplink signals and the downlink signals simultaneously.

9. The method according to claim 8, wherein the number of UEs transmitting uplink signals on the same time and frequency resource unit is at least two, and signal vector spaces of the UEs transmitting uplink signals on the same time and frequency resource unit are orthogonal to each other;

and/or,

the number of UEs receiving downlink signals on the same and frequency resource unit is at least two, and signal vector spaces of the UEs receiving downlink signals on the same and frequency resource unit are orthogonal to each other.

15. The method according to claim 8, wherein determining, according to the interference degree, one or more UEs transmitting uplink signals and one or more UEs receiving downlink signals on the same time and frequency resource unit among the at least two UEs comprises:

determining a schedule weight of uplink transmission and downlink transmission performed by each UE on the time and frequency resource unit; and

one of the following processes;

determining, according to the schedule weight of uplink transmission, UEs transmitting uplink signals on the time and frequency resource unit, and then determining, according to the interference degree and the schedule weight of downlink transmission, UEs receiving downlink signals on the time and frequency resource;

or,

determining, according the schedule weight of downlink transmission, UEs receiving downlink signals on the time and frequency resource unit, and then determining, according to the interference degree and the schedule weight of uplink transmission, UEs transmitting uplink signals on the time and frequency resource.

16. The method according to claim 8, wherein determining, according to the interference degree, one or more UEs transmitting uplink signals and one or more UEs receiving downlink signals among the at least two UEs, and then determining the time and frequency resource unit configured to transmit the uplink signals and the downlink signals simultaneously comprises:

determining combinations of UEs allowed to performing uplink and downlink transmission simultaneously and schedule weights of the combinations during full-duplex transmission;

determining, according to the schedule weights during full-duplex transmission, UE combinations for uplink and downlink transmission on all time and frequency resource units on which full-duplex transmission is able to be performed.

10. A site device, comprising:

an obtaining module, configured to;

obtain an interference degree that is caused when the site device performs full-duplex transmission with at least two User Equipment (UEs),

obtain a degree of mutual interference between uplink and downlink signals of the at least two UEs during full-duplex transmission and obtain a degree of self-interference of a transmit signal on a received signal of the site device during full-duplex transmission;

wherein the obtaining module comprises;

a first obtaining unit, configured to obtain power information of self-interference of the transmit signal on the received signal, and

a second obtaining unit, configured to obtain, according to the power information of self-interference and power information of the received signal, a degree of difference between self-interference power and received signal power, and determine, according to the decree of difference, a decree of self-interference; and

a determining module, configured to determine, according to the interference degree, UEs allowed to transmit uplink and downlink signals with the site device on a same time and frequency resource among the at least two UEs;

wherein one or more UEs that are determined to transmit uplink signals and one or more UEs that are determined to transmit downlink signals on the same time and frequency resource are classified as having a low interference degree.

11. The device according to claim 10, wherein the obtaining module further comprises:

a first receiving unit, configured to receive position information of the at least two UEs sent by the at least two UEs; and

a first determining unit, configured to determine, according to the position information of the at least two UEs, a relative distance between the at least two UEs; and

determine, according to the relative distance, the degree of mutual interference, wherein the shorter the relative distance is, the higher the degree of mutual interference is.

12. The device according to claim 10, wherein the obtaining module further comprises:

a second receiving unit, configured to receive uplink signals sent by the at least two UEs; and

a second determining unit, configured to determine, according to the uplink signals, the position information of the at least two UEs;

determine, according to the position information of the at least two UEs, a relative distance between the at least two UEs; and

determine, according to the relative distance, the degree of mutual interference, wherein the shorter the relative distance is, the higher the degree of mutual interference is.

13. The device according to claim 10, wherein the obtaining module further comprises:

a third receiving unit, configured to receive short-distance communication equipment identities sent by the at least two UEs, wherein a short-distance communication equipment identity is an equipment identity of a UE allowed to perform short-distance communication with the UE; and

a third determining unit, configured to determine, according to the short-distance communication equipment identities, that mutual interference exists between a UE which reports the short-distance communication equipment identity and the UE which the short-distance communication equipment identity belongs to.

14. The device according to claim 10, wherein the determining module is configured to:

determine, according to the interference degree, one or more UEs transmitting uplink signals and one or more UEs receiving downlink signals on the same and frequency resource unit among the at least two UEs;

or,

determine, according to the interference degree, one or more UEs transmitting uplink signals and one or more UEs receiving downlink signals among the at least two UEs, and then determine the time and frequency resource unit configured to transmit the uplink signals and the downlink signals simultaneously.