Resource management with device-device communication in next generation cellular networks

• US 9,735,945 B2
• Filed: 07/24/2014
• Issued: 08/15/2017
• Est. Priority Date: 07/26/2013
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Sundaresan, Karthikeyan
• Primary Examiner(s): Mills, Donald
• Application Number:
  US14/340,263
• Publication Number:
  US 20150029908A1
• Time in Patent Office: 1,118 Days
• Field of Search: None
• 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 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 72/52 based on load

Abstract

At the beginning of every epoch the invention estimates the average traffic demand from cellular and device-to-device traffic in each sector in either DL or UL directions based on history from previous epochs. It partitions the network into interfering sectors and employing device-to-device traffic to determine the dynamic fractional frequency reuse FFR patterns for each of these clusters. Then, in every frame, for the set of sectors co-located at the same base station and instantaneous traffic demands, the invention solves the problem of device-to-device traffic placement and scheduling of cellular and device-to-device traffic jointly.

Claims

1. A wireless communication system operating as part of a larger network, said wireless communication system comprising:

base stations each having a non-transitory computer readable medium comprising computer readable instructions which when executed by a processor incorporated into each base station facilitate communications as device-to-device D2D or cellular with cellular being interior or exterior in each sector of the wireless communication system,

the processor coupled to read only storage and random access storage resources and having inputs and outputs, the processor executing computer readable instructions to provide resource capability in time division and frequency division duplexing wireless communication systems,

based on a history from previous epochs, the processor estimating at the beginning of every epoch an average traffic or resource demand from cellular and device-to-device traffic in each sector, said resource demand (R′

) for a current epoch in sector j being determined by the processor as a weighted moving average according to the following relationship;

R′

_j,xyz(t)=α

R_j,xyz(t−

1)+(1−

α

)R′

_j,xyz(t−

1)

where x={CELLULAR, D2D} traffic;

y={interior, exterior} traffic; and

z={downlink, uplink}traffic in sector j;

the processor partitioning the network into disjoint small clusters of interfering sectors called cross sectors and utilizing device-to-device traffic to determine dynamic fractional frequency reuse patterns to downlink and uplink jointly for each of the clusters in a distributed and localized manner; and

the base stations operating according to the determined fractional frequency reuse patterns for each sector in the cluster in downlink and uplink directions.

2. The wireless communication system of claim 1, wherein the processor comprises that in every frame, for the set of sectors co-located at a same base station and instantaneous traffic demands, solving a problem of device to device traffic placement and scheduling of cellular traffic jointly on both the downlink and uplink resources as well as across the sectors.

3. The wireless communication system of claim 1, wherein the processor comprises estimating an average traffic or resource demand from cellular and device-to-device traffic in each sector of the network in either downlink or uplink directions.

4. The wireless communication system of claim 1, wherein the processor comprises based on traffic demands determining resource allocation for different types of cellular traffic for each sector in a cluster of interfering sectors located at different base stations while maximizing traffic demand that is satisfied and ensuring resource allocation according to fairness guidelines.

5. The wireless communication system of claim 1, wherein the processor comprises determining sets of users that can be co-scheduled on a resource in the network which includes, at each base station, picking a resource and a set of users, at most one from each sector co-located at the base station, such that it provides the maximum incremental utility to the current schedule and repeating until all resources have been scheduled or not further data remains to be scheduled.

6. The wireless communication system of claim 1, wherein the processor comprises determining sets of users that can be co-scheduled on a resource in the network which includes, at each base station, picking a resource and a user from one of the sectors co-located at the base station, such that it provides the maximum incremental utility to the current schedule, and repeating until all resources have been scheduled and no additional users can be scheduled on resources already allocated, or no further data remains to be scheduled.

7. The wireless communication system of claim 1, wherein the processor comprises determining sets of users that can be co-scheduled on a resource in the network which includes, at each base station, for each non-allocated user, adding it to the current set of allocated users and determining an incremental utility of assigning resources to the considered user with a choice of downlink or uplink resources for device-to-device users being considered.

8. The wireless communication system of claim 1, wherein the processor comprises picking a non-allocated user that provides a maximum incremental utility and adding it to a current schedule and repeating until all users have been allocated.