Inter-network interference coordination method

• US 10,182,448 B2
• Filed: 12/22/2015
• Issued: 01/15/2019
• Est. Priority Date: 12/26/2014
• Status: Active Grant

• Current Assignee: Shanghai Research Center For Wireless Communications
• Original Assignee: Shanghai Research Center For Wireless Communications
• Inventors: Zhu, Yuanping, Wang, Jiang, Yu, Qiaoling, Teng, Yong, Horneman, Kari
• Primary Examiner(s): Mew, Kevin D
• Application Number:
  US15/329,523
• Publication Number:
  US 20170290023A1
• Time in Patent Office: 1,120 Days
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Disclosed is a network interference coordination method in a co-primary spectrum sharing scenario. The method comprises the following steps: a first network and a second network negotiate an inter-network shared band, the shared band being in a shared spectrum pool; the first network evaluates inter-network interference; the first network determines whether to perform internal coordination, if internal coordination is performed, the first network performs internal coordination; if internal coordination is not performed, request the second network to perform inter-network interference coordination; the second network determines whether to perform internal coordination, if internal coordination is performed, the second network performs internal coordination; and if internal coordination is not performed, go back to the step of negotiating, by a first network and a second network, an inter-network shared band. The present invention can fairly and properly implement inter-network interference coordination in the co-primary spectrum sharing scenario.

Claims

1. A network interference coordination method for a first network and a second network which share a shared spectrum pool with the same priority, comprising the following steps:

a step that the first network and the second network negotiate about an inter-network shared frequency band, wherein the shared frequency band is in the shared spectrum pool;

a step that the first network evaluates inter-network interference;

a step that one network of the first network and the second network judges whether to execute internal coordination, if internal coordination can be executed, then the one network executes internal coordination, if internal coordination cannot be executed, then the one network request an another network to conduct inter-network interference coordination;

a step that the another network judges whether to execute internal coordination, if internal coordination can be executed, then the another network executes internal coordination; and

if internal coordination cannot be executed, then turn to the step of “

the first network and the second network negotiate about an inter-network shared frequency band”

.

2. The network interference coordination method according to claim 1, wherein,

the one network is the second network and the another network is the first network, the first network evaluates and communicates inter-network interference to the second network, and then the second network judges whether to execute internal coordination based on the inter-network interference.

3. The network interference coordination method according to claim 1, wherein,

after the step of first network evaluates inter-network interference, the one network judges whether the inter-network interference exceeds a threshold, and if the inter-network interference exceeds the threshold, then the one network judges whether to execute internal coordination;

and if the inter-network interference does not exceed the threshold, then the first network evaluates the inter-network interference again.

4. The network interference coordination method according to claim 1, wherein,

when the one network request the another network to conduct inter-network interference coordination,

the one network sends network-specific inter-network interference indication to the another network to request the another network to conduct inter-network interference coordination,

the network-specific inter-network interference indication includes specific interference values and corresponding carrier numbers, or includes interference levels and corresponding carrier numbers.

5. The network interference coordination method according to claim 4, wherein,

when the second network is requested to conduct inter-network interference coordination, the second network determines interference-causing cells in the second network which cause interference to the first network, according to the corresponding carrier numbers in the network-specific inter-network interference indication received by the second network.

6. The network interference coordination method according to claim 1, wherein,

the another network judges whether the inter-network interference exceeds a threshold, and if the inter-network interference exceeds a threshold, then the second network judges whether to execute internal coordination.

7. The network interference coordination method according to claim 1, wherein,

the first network and the second network negotiate about an inter-network shared frequency band, and also negotiate about exclusive frequency bands for the first network and exclusive frequency bands for the second network,

when the second network judges whether to execute internal coordination, the second network judges whether there are enough exclusive frequency bands which can be allocated to the interference-causing cells.

8. The network interference coordination method according to claim 1, wherein,

when the second network judges whether to execute internal coordination, the second network judges whether the second network can decrease transmission power of the interference-causing cells or reschedule the interference-causing cells to new carriers.

9. The network interference coordination method according to claim 6, wherein,

when the second network returns to negotiate about an inter-network shared frequency band with the first network, the second network sends an inter-network spectrum reallocation request to the first network, and if the first network agrees, then an inter-network spectrum reallocation response signaling is sent to the second network to trigger the update of a network spectrum occupation mode.

10. The network interference coordination method according to claim 1, wherein,

the first network comprises interference-affected cells suffering from interference of the second network;

when the first network judges whether to execute internal coordination, the first network judges whether the first network has enough exclusive frequency bands to be allocated to the interference-affected cells.

11. The network interference coordination method according to claim 6, wherein,

when the first network evaluates and communicates inter-network interference, the first network periodically communicates network-specific inter-network interference indication to the second network, and according to corresponding carriers in the network-specific inter-network interference indication, in combination with carrier allocation information of each cell of the second network, the second network figure out interference-causing cells of the second network causing interference on the first network.

12. The network interference coordination method according to claim 1, wherein,

the step of “

the first network evaluates inter-network interference”

includes the following steps;

Step 2A;

a terminal of the first network estimates and sends inter-network interference received by the terminal to a base station of the first network;

Step 2B;

according to the inter-network interference reported by the terminal, the base station estimates cell-specific inter-network interference in the first network;

Step 2C;

within a given statistical period, the base station calculates inter-network interference power on each resource block, and then calculates a cell-specific inter-network interference average on the basis of the inter-network interference power on each resource block in a carrier allocated by the base station, to generate a cell-specific inter-network interference report.

13. The network interference coordination method according to claim 12, wherein,

in Step 2A, the cells using the shared frequency band or all the cells using the shared spectrum pool in the first network submit inter-network interferences received by the cells.

14. The network interference coordination method according to claim 12, wherein,

according to the cell-specific inter-network interferences reported by all the cells assigned to each carrier in the shared frequency band, an average or maximum value of the inter-network interferences received by the network on each carrier is obtained, the average or maximum value of the inter-network interferences are added up, and thereby network-specific inter-network interference is obtained.

15. The network interference coordination method according to claim 12, wherein,

the network-specific inter-network interference is obtained by the following method:

for each carrier in the shared frequency band, an average or maximum value of inter-network interferences received by the network on the carrier is obtained, according to cell-specific inter-network interferences reported by all the cells assigned to the carrier, and

N network interference thresholds are chosen to quantify the average or maximum values of the inter-network interferences, so that N+1 levels which respectively correspond to the inter-network interference average received by the network on each carrier are obtained to serve as network-specific inter-network interference indication, N is the number of network interference thresholds.

16. The network interference coordination method according to claim 12, wherein,

the network-specific inter-network interference is obtained by the following method:

M inter-network interference thresholds are chosen to quantify the cell-specific inter-network interference reported by each base station into M+1 levels, which respectively correspond to each carrier, the quantity of the cells with cell-specific inter-network interferences at each level is counted, and the network-specific inter-network interference indication is generated on the basis of the cell quantity, M is the number of inter-network interference thresholds.

17. The network interference coordination method according to claim 12, wherein,

in the step of “

the first network evaluates inter-network interference”

, the cells using the shared frequency band or all the cells using the shared spectrum pool in the first network report the inter-network interferences they received;

in the case that the cells using the shared frequency band report the inter-network interferences, the network-specific inter-network interference indication includes inter-network interference values received by the first network on each carrier in the shared frequency band or in the shared spectrum pool;

in the case that all the cells using the shared spectrum pool in the first network report the inter-network interferences they received, the network-specific inter-network interference indication includes inter-network interference values received by the first network on each carrier in the shared spectrum pool.

18. The network interference coordination method according to claim 1, wherein,

the first network comprises interference-affected cells suffering from interference of the second network;

when the first network judges whether to execute internal coordination, the first network judges whether the first network can handover the corresponding users of the interference-affected cells to neighboring cells.

19. The network interference coordination method according to claim 1, wherein,

when the first network evaluates inter-network interference,

the first network calculates cell-specific inter-network interference on the basis of inter-network interference power on each resource block in a carrier, according to inter-network interference received by the terminal.

20. The network interference coordination method according to claim 19, wherein,

the cell-specific inter-network interference report includes the inter-network interference averages of specific carriers and the corresponding carrier numbers.