System and method for boundaryless service in wireless networks with cooperative transmission points

• US 10,455,590 B2
• Filed: 08/22/2013
• Issued: 10/22/2019
• Est. Priority Date: 08/22/2013
• 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: Zarifi, Keyvan, Baligh, Mohammadhadi, Ma, Jianglei, Maaref, Amine
• Primary Examiner(s): Appiah, Charles N
• Assistant Examiner(s): Zhang, Xiang
• Application Number:
  US13/973,523
• Publication Number:
  US 20150057010A1
• Time in Patent Office: 2,252 Days
• 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: H04B 7/0617 for beam forming
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

Embodiments are provided to serve user equipments (UEs) that experience, for example persistently, inter-transmission point group (TPG) interference in a wireless or cellular network. The embodiments include steps to serve edge UEs (EUs) such as persistent EUs (PEUs) using a set of transmission points (TPs) in one or more TPGs. The selected set of TPs used for serving the EUs or PEUs are dynamically determined based on a UE-centric metric. The metric involves the PEUs and surrounding UEs. The UE-centric metric is used to partition the network to multiple TPG sets. For each one of multiple assigned resource units (RUs), a TPG set that maximizes or improves a network-wide utility is used for scheduling transmissions. Further, for each RU, the UEs are associated with an optimized or improved TPG in the used TPG set.

Claims

1. A method performed by a network component for serving one or more user equipment (UEs) experiencing inter-transmission point group (TPG) interference in a wireless network, the method comprising:

selecting a set of transmission points (TPs) from a plurality of TPGs in a network to serve an edge UE (EU) experiencing inter-TPG interference at a plurality of resource units (RUs), the plurality of TPGs comprising a first TPG and a second TPG, wherein the EU experiences inter-TPG interference from the first TPG at a first RU and experiences inter-TPG interference from the second TPG at a second RU, and wherein the set of TPs is selected according to a metric associated with the EU including a channel condition of the EU;

grouping the selected set of TPs into a first TPG patch (TPGP) for the first RU and a second TPGP for the second RU, the first TPGP comprising one or more TPs of the first TPG, and the second TPGP comprising one or more TPs of the second TPG; and

performing transmission coordination for the EU between the one or more TPs of the first TPGP and other terminals of the network at the first RU and transmission coordination for the EU between the one or more TPs of the second TPGP and other terminals of the network at the second RU.

2. The method of claim 1, wherein performing transmission coordination for the EU between the one or more TPs of the first TPGP and the other terminals of the network includes performing interference coordination between the one or more TPs of the first TPGP and the other terminals of the network.

3. The method of claim 1, wherein performing transmission coordination for the EU between the one or more TPs of the first TPGP and the other terminals of the network includes performing Coordinated Multi-Point (CoMP) transmission between the one or more TPs of the first TPGP and the other terminals of the network.

4. The method of claim 1, wherein at least one of the selected set of TPs of the first TPGP further serves at least one other UE allocated in a TPG outside the first TPGP.

5. The method of claim 1, wherein the metric includes at least one of Reference Signal Receive Power (RSRP) information, average rate information, instantaneous channel information, and TPG load information.

6. The method of claim 1, wherein the metric further includes a channel condition for a UE neighboring the EU.

7. The method of claim 1, further comprising:

selecting a second set of TPs from the plurality of TPGs to serve a second EU experiencing inter-TPG interference at the plurality of RUs, the second set of TPs selected according to a metric associated with the second EU including a channel condition of the second EU;

grouping the second set of TPs into a second TPGP for at least one of the plurality of RUs; and

performing transmission coordination for the second EU between the one or more TPs of the second TPGP and the other terminals of the network.

8. The method of claim 7, wherein the grouping of the second set of TPs into the second TPGP is for at least one RU of the first TPGP.

9. The method of claim 7, wherein the grouping of the second set of TPs into the second TPGP is for at least one RU different from at least one RU of the first TPGP.

10. The method for claim 1, further comprising:

for each of the plurality of RUs, determining TPGs for serving a plurality of UEs in the network;

selecting, from the UEs, the EU better suitable for receiving service help; and

grouping the TPs into a corresponding TPGP for the selected EU, or allocating for the selected EU a null TPGP comprising no TPs.

11. The method of claim 1, wherein the EU is a persistent edge EU.

30. The method of claim 1, wherein a TP of the TPs remains part of the TPGs after selecting the set of TPs from the TPGs.

12. A method performed by a network component for serving one or more user equipment (UEs) experiencing inter-transmission point group (TPG) interference in a wireless network, the method comprising:

selecting a set of TPs from a plurality of TPGs in a network to serve an edge UE (EU) experiencing inter-TPG interference at a plurality of resource units (RUs), the plurality of TPGs comprising a first TPG and a second TPG, wherein the EU experiences inter-TPG interference from the first TPG at a first RU and experiences inter-TPG interference from the second TPG at a second RU, and wherein the set of TPs is selected according to a metric associated with the EU including a channel condition of the EU, the selected set of TPS comprising TPs from the first TPG and TPs from the second TPG; and

implementing inter-TPG cooperation for transmission between the TPs from the first TPG for the first RU and between the TPs from the second TPG for the second RU while maintaining required quality of service (QoS) for other terminals.

13. The method of claim 12, further comprising:

scheduling transmission for the EU from at least one first TP in a first TPG serving the EU;

exchanging transmission data with at least one second TP in a second TPG neighboring the first TPG; and

implementing inter-TPG joint transmission to the EU from the first TP and the second TP.

14. The method of claim 13, further comprising reducing interference at the EU in accordance with the exchanged transmission data, wherein the second TP is a dominant interfering TP to the EU.

15. The method of claim 12, further comprising:

exchanging transmission data with at least one second TP in a second TPG neighboring a first TPG serving the EU;

scheduling transmission for the EU from at least one first TP in the first TPG and from the second TP in the second TPG; and

implementing inter-TPG joint transmission to the EU from the first TP and the second TP.

16. The method of claim 12, further comprising:

scheduling transmission for the EU from at least one first TP in a first TPG serving the EU; and

performing coordinated beam-forming and power reduction with a dominant interfering TP in a second TPG neighboring the first TPG.

17. The method of claim 12, wherein the EU is a persistent edge EU.

18. A network component for serving one or more user equipment (UEs) experiencing inter-transmission point group (TPG) interference in a wireless network, the network component comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

select a set of TPs from a plurality of TPGs in a network to serve an edge UE (EU) experiencing inter-TPG interference at a plurality of resource units (RUs), the plurality of TPGs comprising a first TPG and a second TPG, wherein the EU experiences inter-TPG interference from the first TPG at a first RU and experiences inter-TPG interference from the second TPG at a second RU, and wherein the set of TPs is selected according to a metric associated with the EU including a channel condition of the EU;

group the selected set of TPs into a first TPG patch (TPGP) for the first RU and a second TPGP for the second RU, the first TPGP comprising one or more TPs of the first TPG, and the second TPGP comprising one or more TPs of the second TPG; and

perform transmission coordination for the EU between the one or more TPs of the first TPGP and other terminals of the network at the first RU and transmission coordination for the EU between the one or more TPs of the second TPGP and other terminals of the network at the second RU.

19. The network component of claim 18, wherein the instructions to perform transmission coordination for the EU between the one or more TPs of the first TPGP and the other terminals of the network includes further instructions to perform at least one of interference coordination and Coordinated Multi-Point (CoMP) transmission between the one or more TPs of the first TPGP and the other terminals of the network.

20. The network component of claim 18, wherein the metric includes at least one of Reference Signal Receive Power (RSRP) information, average rate information, instantaneous channel information, and TPG load information, and wherein the metric further includes a channel condition for at least one UE neighboring the EU.

21. The network component of claim 18, wherein the network component is one of the set of TPs or a central coordinating unit (CCU).

22. The network component of claim 18, wherein the EU is a persistent edge EU.

23. A network component for serving one or more user equipment (UEs) experiencing inter-transmission point group (TPG) interference in a wireless network, the network component comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

select a set of TPs from a plurality of TPGs in a network to serve an edge UE (EU) experiencing inter-TPG interference at a plurality of resource units (RUs), the plurality of TPGs comprising a first TPG and a second TPG, wherein the EU experiences inter-TPG interference from the first TPG at a first RU and experiences inter-TPG interference from the second TPG at a second RU, and wherein the set of TPs is selected according to a metric associated with the EU including a channel condition of the EU, the selected set of TPS comprising TPs from the first TPG and TPs from the second TPG; and

implement inter-TPG cooperation for transmission between the TPs from the first TPG for the first RU and between the TPs from the second TPG for the second RU while maintaining required quality of service (QoS) for other terminals.

24. The network component of claim 23, wherein the programming includes further instructions to perform inter-TPG joint transmission or coordinated beam-forming and power reduction between at least one first TP in a first TPG serving the EU and at least one second TP in a second TPG neighboring the first TPG, and wherein the EU is located in the first TPG at a boundary between the first TPG and the second TPG.

25. The network component of claim 23, wherein the EU is a persistent edge EU.

26. A method performed by a network component for serving one or more user equipment (UEs) experiencing inter-transmission point group (TPG) interference in a wireless network, the method comprising:

selecting a set of transmission points (TPs) from multiple TPGs in a network to serve an edge UE (EU) experiencing inter-TPG interference at a plurality of resource units (RUs), the set of TPs selected according to a metric associated with the EU including a channel condition of the EU;

grouping the selected set of TPs into a TPG patch (TPGP) for at least one of the plurality of RUs;

performing transmission coordination for the EU between the TPs of the TPGP and other terminals of the network;

for each of the TPs from the TPGs, considering for the TPGP a next TP with a better channel condition to the EU;

performing a joint transmission to the EU using all current considered TPs;

removing a last considered TP from the TPGP upon determining that the TPGP with all current considered TPs results in lowering network-wide utility to at least on UE outside the TPGP below an acceptable threshold; and

discarding the TPGP upon determining that an improvement in the channel condition of the EU under consideration using the TPGP is below a predetermined threshold.

27. The method of claim 26, further comprising reducing transmit power in the TPGP to match the improvement in a channel condition in the other terminals of the network to a predetermined threshold.

28. The method of claim 26, further comprising:

for each UE from a plurality of considered UEs, performing a Coordinated Multi-Point (CoMP) joint transmission from the TPGP to the UE; and

including the UE in the CoMP joint transmission upon detecting an improvement in the channel condition or discarding the UE otherwise.

29. The method of claim 26, further comprising for each EU from a plurality of considered EUs, adding the EU to a set of current EUs served by the TPGP upon determining that the TPGP and the other terminals of the network satisfy a predetermined channel condition or network-wide utility.

31. A method performed by a network component for serving one or more user equipment (UEs) experiencing inter-transmission point group (TPG) interference in a wireless network, the method comprising:

selecting a set of transmission points (TPs) from a plurality of TPGs in a network to serve an edge UE (EU) experiencing inter-TPG interference at a plurality of resource units (RUs), the plurality of TPGs comprising a first TPG and a second TPG, wherein the EU experiences inter-TPG interference from the first TPG at a first RU and experiences inter-TPG interference from the second TPG at a second RU, and wherein the set of TPs is selected according to a metric associated with the EU including a channel condition of the EU;

grouping the selected set of TPs into a TPG patch (TPGP) for at least one of the plurality of RUs, the TPGP comprising one or more TPs of the first TPG and one or more TPs of the second TPG; and

performing transmission coordination for the EU between the TPs of the TPGP and other terminals of the network.