Method for supporting asymmetric service flexible in multi-carrier time division duplex mobile communication system

• US 8,077,640 B2
• Filed: 09/12/2005
• Issued: 12/13/2011
• Est. Priority Date: 09/13/2004
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Li, Shihe, Yang, Guiliang, Hu, Jinling
• Primary Examiner(s): HOANG, THAI D
• Application Number:
  US11/662,679
• Publication Number:
  US 20080192660A1
• Time in Patent Office: 2,283 Days
• Field of Search: 370/280, 370/294, 370/337, 370/347, 370/395.21, 370/395.41
• US Class Current: 370/280
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/29 between an access point and the access point controlling device
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS

Abstract

A method to support dissymmetry service for multicarrier time division duplexing mobile communication system, which contains adopting different uplink and downlink time gap conversion point to support dissymmetry service among multicarrier frequency of different cells and same cell, when the original configured uplink and downlink time gap ratio can not support the service request, then changing the time gap ratio to receiving said request, adjusting service to avoid interference by quick dynamic channel distribution technology, in ending request service, changing time gap ratio in original ratio. Said invention supports different uplink and downlink time gap conversion point, the base station equipment needs establishing isolated uplink and downlink.

Claims

1. A method for supporting asymmetric services in a multi-carrier time division duplex mobile communication system, configured to support asymmetric services with different switching points between downlink and uplink slots on a plurality of carrier frequencies in adjacent cells and a plurality of carrier frequencies in a same cell, said method comprising:

A. when a ratio between uplink and downlink service slots required by a requested asymmetric service is unable to be supported by an initial ratio setting for a relating carrier frequency of a cell, determining whether the service is able to be supported by changing the ratio between uplink and downlink service slots for the carrier frequency of the cell;

B. if the determining is positive, changing the ratio between uplink and downlink service slots for the carrier frequency of the cell, otherwise, rejecting said requested service;

C. determining whether another service carried on a service slot of another carrier frequency of the same cell or of an adjacent cell is interfered by the changing, and adjusting, the another service carried on the service slot and determined to be interfered, to be carried on another service slot, so that the another service is not interfered by the changing.

2. The method according to claim 1, further comprising

D. receiving uplink radio frequency signals in a uplink constituted by separate receiving antennae, feeding cables and receivers, and transmitting downlink radio frequency signals in a downlink constituted by separate transmitting antennae, feeding cables and transmitters.

3. The method according to claim 2, further comprising

E. changing the ratio between uplink and downlink service slots for the carrier frequency back to the ratio initially set when completing the requested asymmetric service.

4. The method according to claim 1, wherein in step A, the ratio between uplink and downlink service slots required by a requested asymmetric service being unable to be supported by the ratio between uplink and downlink service slots initially set for one carrier frequency includes:

a data transmission rate required by the requested service exceeding a maximum data transmission rate available in uplink or downlink of the initial setting.

5. The method according to claim 1, wherein in step A, the ratio between uplink and downlink service slots required by a requested asymmetric service being unable to be supported by the ratio between uplink and downlink service slots initially set for one carrier frequency includes:

remaining resources after carrying the services under initial setting being insufficient to carry the requested service.

6. The method according to claim 1, wherein in step A, determining whether the service is able to be supported by changing the ratio between uplink and downlink service slots for the carrier frequency includes:

determining whether there are sufficient resources in an opposite transmission direction that can transmit the service in a current direction.

7. The method according to claim 1, wherein the step C further comprising

C1. selecting one carrier frequency having sufficient remaining resources in the cell where said request is being made;

C2. determining services carried on other carrier frequencies in the cell and services carried on all the carrier frequencies in adjacent cells that will be interfered when the uplink and downlink slots arrangement for the carrier frequency is changed by analysis;

C3. avoiding interference by adjusting the services that are determined to be interfered into other slots on its operating carrier frequency or the other carrier frequencies that will not be interfered by rapid Dynamic Channel Allotting (DCA) technology.

8. The method according to claim 7, wherein said determining by analysis in step C2 is to examine whether in a direction of shaped wave packet of a user making the request, there are said other carrier frequencies or said adjacent cells receiving signals from terminals in the direction of the shaped wave packet during slots more than the originally allotted slots.

9. The method according to claim 7, wherein said determining by analysis in step C2 is to examine whether there are said other carrier frequencies or said adjacent cells transmitting signals to terminals in the direction of the shaped wave packet during slots fewer than the originally allotted slots in the direction of the shaped wave packet.

10. The method according to claim 8, wherein said examining further comprises:

a Radio Network Controller (RNC) performing management on wireless resources by referring to the database of the operating state of the system according to direction of the incoming wave packet of the user making the calling request and width of the shaped wave packet, wherein

the database records and updates the state of each operating terminal within the management range of the RNC in real time, which includes the wireless resources allotted with carrier frequency, slots and code channel, the carried services, measured data obtained by routine measurement in accordance with communication standard, and position information of the terminals including distance and direction of the terminals with respect to base stations, and data regarding relative positions of cell antennae within management range and regarding width of the shaped wave packets of each cell antenna.

11. The method according to claim 9, wherein said examining further comprises:

a Radio Network Controller (RNC) performing management on wireless resources by referring to the database of the operating state of the system according to direction of the incoming wave packet of the user making the calling request and width of the shaped wave packet, wherein

the database records and updates the state of each operating terminal within the management range of the RNC in real time, which includes the wireless resources allotted with carrier frequency, slots and code channel, the carried services, measured data obtained by routine measurement in accordance with communication standard, and position information of the terminals including distance and direction of the terminals with respect to base stations, and data regarding relative positions of cell antennae within management range and regarding width of the shaped wave packets of each cell antenna.

12. The method according to claim 7, wherein said step C3 determines whether the interference is able to be avoided by referring to the database of the system operating state and performing management on wireless resources by a Radio Network Controller (RNC) according to the direction of the incoming wave packet of the user making the calling request and the width of the shaped wave packet, wherein

the database records and updates the state of each operating terminal within the management range of the RNC in real time, which includes the wireless resources allotted with carrier frequency, slots and code channel, the carried services, measured data obtained by routine measurement in accordance with communication standard, and position information of the terminals including distance and direction of the terminals with respect to base stations, and data regarding relative positions of cell antennae within management range and regarding width of the shaped wave packets of each cell antenna.

13. The method according to claim 1, wherein in said step B, while changing the uplink and downlink slot ratio, related information data in database of the system operating state of a Radio Network Controller (RNC) is updated.

14. The method according to claim 3, wherein in said step E, while changing the uplink and downlink slot ratio, related information data in database of the system operating state of a Radio Network Controller (RNC) is updated.

15. The method according to claim 2, wherein in said step D, isolation control is performed between the uplink and the downlink, to make the leakage from the transmitting to the receiving as low as possible;

and the transmitter and the receiver are controlled separately.