Adaptive uplink/downlink timeslot assignment in a hybrid wireless time division multiple access/code division multiple access communication system

• US 8,842,644 B2
• Filed: 01/05/2009
• Issued: 09/23/2014
• Est. Priority Date: 07/27/2000
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Zeira, Ariela, Pani, Jung-Lin
• Primary Examiner(s): Patel, Jay P
• Application Number:
  US12/348,637
• Publication Number:
  US 20090109935A1
• Time in Patent Office: 2,087 Days
• Field of Search: 370/329, 370/337, 370/347, 370/442, 370/458
• US Class Current: 370/337
• CPC Class Codes: H04B 7/2618 using hybrid code-time division multiple access [CDMA-TDMA]
• 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 52/143 Downlink power control
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/1273 of downlink data flows
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method of adaptive uplink/downlink timeslot assignment includes determining at least one of a potentially interfering cell which potentially interferes with a particular cell. A timeslot for uplink communication is eliminated, if a first one of the potentially interfering cells uses that timeslot for downlink communications. A timeslot for downlink communication is eliminated if a dynamic interference measurement in that timeslot as measured by most users exceeds a predetermined threshold and if a dynamic interference measurement in that timeslot does not exceed the predetermined threshold for most users but exceeds the predetermined threshold for at least one user. A timeslot is assigned to an uplink communication of the particular cell using non-uplink eliminated timeslots, and a timeslot is assigned to a downlink communication of the particular cell to each user using non-downlink eliminated timeslots with respect to that user.

Claims

1. A method of adaptive uplink/downlink timeslot assignment, implemented in a Node-B, comprising:

determining at least one of a potentially interfering cell which potentially interferes with a particular cell;

eliminating a timeslot for uplink communication, on a condition that a first one of the potentially interfering cells uses that timeslot for downlink communications;

eliminating a timeslot for downlink communication for at least one user on a condition that a dynamic interference measurement in that timeslot as measured exceeds a predetermined threshold for the at least one user;

assigning a timeslot to an uplink communication of the particular cell using timeslots not eliminated for uplink communication; and

assigning a timeslot to a downlink communication of the particular cell to each user using timeslots not eliminated for downlink communication with respect to that user, on a condition that the dynamic interference measurement in that timeslot as measured does not exceed the predetermined threshold.

2. The method of claim 1, wherein the Node-B is a hybrid time division multiple access/code division multiple access Node-B.

3. The method of claim 1, wherein the Node-B is a time division duplex Node-B using code division multiple access.

4. A wireless network device comprising:

a resource assignment device configured to determine an uplink interference associated with a plurality of uplink resources and produce an uplink list indicating a high or low interference for each of the uplink resources;

wherein the resource assignment device is further configured to determine a downlink interference associated with a plurality of downlink resources and produce a downlink list indicating a high or low interference for each of the downlink resources;

wherein the wireless network device sends the uplink list and the downlink list;

wherein the wireless network device receives an uplink list and a downlink list for each of a plurality of neighboring wireless network devices; and

wherein the resource assignment device is further configured to assign available uplink and downlink timeslots to a user equipment based on the received uplink and downlink lists.

5. The wireless network device of claim 4, wherein a threshold test is used to determine high or low interference for the uplink and downlink resources.

6. The wireless network device of claim 4, wherein the resources assignment device is configured to schedule resources using a decentralized architecture.

7. The wireless network device of claim 4, wherein the wireless network device is a Node B.

8. A method for wireless communication, comprising:

determining an uplink interference associated with a plurality of uplink resources;

producing an uplink list indicating a high or low interference for each of the uplink resources;

determining a downlink interference associated with a plurality of downlink resources;

producing a downlink list indicating a high or low interference for each of the downlink resources;

sending the uplink list and the downlink list;

receiving an uplink list and a downlink list for each of a plurality of neighboring wireless network devices; and

assigning available uplink and downlink timeslots to user equipment based on the received uplink and downlink lists.

9. The method of claim 8, wherein a threshold test is used to determine high or low interference for the uplink and downlink resources.

10. The method of claim 8, further comprising scheduling resources using a decentralized architecture.

11. The method of claim 8, wherein the wireless network device is a Node B.