Adapting a diversity transmission mode in a wireless communication system

• US 20040229624A1
• Filed: 04/30/2004
• Published: 11/18/2004
• Est. Priority Date: 05/12/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Harrison, Robert Mark, Cai, Zhijun, Ahmed, Mansoor
• Granted Patent: US 7,058,407 B2
• Time in Patent Office: Days
• US Class Current: 455/449
• CPC Class Codes: H04L 1/1657 Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
• CPC Class Codes: H04L 1/1692 Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/327 Power control of multicast channels
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A controller (102) in a fixed network of a wireless data communication system (100) transmits an indication that a diversity transmission of the information stream is available. When predetermined capabilities of a user equipment (112) and the fixed network are sufficient to allow soft combining of a primary transmission and the diversity transmission of bits of the information stream in the user equipment, the controller further transmits primary and diversity transmissions in a manner that facilitates soft combining in the user equipment, and transmits a group identity of the information stream to indicate that the information stream is in the primary and diversity transmissions.

Claims

1. A controller for adapting a diversity transmission mode to provide point-to-multipoint transmission diversity of packet data derived from an information stream in a fixed network of a wireless data communication system, the controller comprising:

at least one communication interface for receiving the information stream and for communicating with a base station of the communication system; and

a processor coupled to the at least one communication interface for processing the information stream and for controlling the base station;

wherein the processor is programmed to transmit an indication that a diversity transmission of the information stream is available; and

wherein, when predetermined capabilities of a user equipment (UE) and the fixed network are sufficient to allow soft combining of a primary transmission and a diversity transmission of bits of the information stream in the UE, the processor is further programmed to;

transmit the primary and diversity transmissions in a manner that facilitates soft combining in the UE, and

transmit a group identity of the information stream to indicate that the information stream is in the primary and diversity transmissions.

2. The controller of claim 1, wherein, when transmitting the primary and diversity transmissions in a manner that facilitates soft combining in the UE, the processor is further programmed to:

determine a primary encoded symbol block from a first set of information bits, and a diversity encoded symbol block only from the first set of information bits, wherein the primary encoded symbol block and the diversity encoded symbol block comprise a number of symbols less than a maximum number of symbols in a predetermined time period; and

transmit the primary and diversity encoded symbol blocks in the primary and diversity transmissions, respectively.

3. The controller of claim 1, wherein, when predetermined capabilities of the UE and the fixed network are not sufficient to allow soft combining of the primary and diversity transmissions in the UE, the processor is further programmed to:

transmit the primary and diversity transmissions in a manner that facilitates selection combining, but not necessarily soft combining, in the UE;

determine primary and diversity encoded symbol blocks from the information stream, the diversity encoded symbol block allowed to include bits different from those of the primary encoded symbol block; and

transmit the primary and diversity encoded symbol blocks in the primary and diversity transmissions, respectively.

4. The controller of claim 1, wherein the processor is further programmed to transmit an indication of a maximum number of symbols to be sent in a predetermined time period.

5. The controller of claim 1, wherein the processor is further programmed to transmit an indication of a maximum delay between transmissions on the primary and diversity transmissions.

6. The controller of claim 1, wherein the processor is further programmed to concurrently transmit the group identity of the information stream along with a first encoded symbol block to produce a dynamic identity indication.

7. The controller of claim 6, wherein the processor is further programmed to transmit a synchronization indication of the information stream.

8. The controller of claim 1, wherein the processor is further programmed to separately transmit the group identity of the information stream and a first encoded symbol block to produce a static identity indication.

9. The controller of claim 1, wherein the processor is further programmed to transmit the diversity transmission in response to receiving a group negative acknowledgement (NAK) from at least one UE.

10. The controller of claim 1, wherein the processor is further programmed to transmit the diversity transmission during a predetermined time interval known to both the UE and the fixed network.

11. The controller of claim 1, wherein the processor is further programmed to adjust a transmit power of at least one of the primary transmission and the diversity transmission in response to receiving a group negative acknowledgement (NAK).

12. The controller of claim 1, wherein the processor is further programmed to transmit the diversity transmission from a cell different from the cell transmitting the primary transmission.

13. The controller of claim 1, wherein the processor is further programmed to identify from the group NAK a cell for which the group NAK is intended.

14. A controller for adapting a diversity transmission mode to provide point-to-multipoint transmission diversity of packet data derived from an information stream in a fixed network of a wireless data communication system, the controller comprising:

at least one communication interface for receiving the information stream and for communicating with a base station of the communication system; and

a processor coupled to the at least one communication interface for processing the information stream and for controlling the base station;

wherein the processor is programmed to cooperate with the base station to;

indicate that a diversity transmission of the information stream is available;

determine a primary and a diversity encoded symbol block from an information block of the information stream;

transmit the primary encoded symbol block on a primary channel; and

transmit the diversity encoded symbol block on a diversity channel in response to receiving a group negative acknowledgement (NAK) from at least one user equipment (UE).

15. The controller of claim 14, wherein the processor is further programmed to transmit the diversity encoded symbol block during a predetermined time interval known to both the UE and the fixed network.

16. The controller of claim 14, wherein the processor is further programmed to adjust a transmit power of at least one of the primary channel and the diversity channel in response to receiving a group negative acknowledgement (NAK) from at least one UE.

17. The controller of claim 14, wherein the processor is further programmed to transmit an indication of a maximum number of symbols to be transmitted in the diversity transmission.

18. The controller of claim 14, wherein the processor is further programmed to transmit a group identity of the primary and diversity channels.

19. The controller of claim 14, wherein the processor is further programmed to:

select a maximum number of symbols to be transmitted on the diversity transmission in a predetermined time period;

determine information bits in the primary and diversity encoded symbol blocks, using identical information bits from the information stream, wherein the information stream has an identity;

ensure that the diversity transmission contains no more than the maximum number of symbols; and

transmit the identity of the information stream on the primary and diversity channels.

20. A wireless user equipment (UE) for adapting a diversity reception mode to receive point-to-multipoint transmission diversity of packet data derived from an information stream in a fixed network of a wireless communication system, the UE comprising:

a transceiver for communicating with the fixed network; and

a processor coupled to the transceiver for controlling the transceiver,

wherein the processor is programmed to cooperate with the transceiver to;

receive a group identity of the information stream; and

when the fixed network encodes a primary symbol block in a primary transmission from a first set of information bits and also encodes a diversity symbol block in a diversity transmission from the first set of information bits, wherein the diversity symbol block comprises a number of symbols less than a predetermined maximum number of symbols in a predetermined time period,

receive, combine, and decode the primary and diversity symbol blocks to produce a decoded received information block; and

,

when the fixed network performs one of;

(a) transmitting a number of symbols greater than the predetermined maximum number of symbols in the diversity symbol block in the predetermined time period; and

(b) determining the primary transmission from a second set of information bits different from the first set of information bits;

receive, select, and decode the primary and diversity symbol blocks to produce a decoded received information block.

21. The UE of claim 20, wherein the processor is further programmed to receive the group identity of the information stream concurrently with the primary transmission and with the diversity transmission to produce a dynamic identity indication.

22. The UE of claim 20, wherein the processor is further programmed to receive the group identity of the information stream separately from the primary and diversity transmissions to produce a static indication of identity.

23. The UE of claim 20, wherein the processor is further programmed to receive the primary and diversity transmissions from a first cell and a second cell, respectively.

24. The UE of claim 20, wherein the processor is further programmed to receive the primary and diversity transmissions at first and second time intervals.

25. The UE of claim 20, wherein the processor is further programmed to receive an indication from the fixed network that the primary and diversity transmissions will be transmitted to facilitate combining of the primary and diversity transmissions.

26. The UE of claim 20, wherein the processor is further programmed to receive a message from the fixed network that indicates an amount of delay between the primary and diversity transmissions.

27. The UE of claim 20, wherein the processor is further programmed to determine a delay between the primary and diversity transmissions.

28. A wireless user equipment (UE) for adapting a diversity reception mode to receive a point-to-multipoint diversity transmission of packet data derived from an information stream in a fixed network of a wireless communication system, the UE comprising:

a transceiver for communicating with the fixed network; and

a processor coupled to the transceiver for controlling the transceiver;

wherein the processor is programmed to cooperate with the transceiver to;

receive an indication that a diversity transmission of the information stream is available;

thereafter, receive a primary transmission on a primary channel;

transmit a group negative acknowledgement (NAK) at a predetermined time on a predetermined reverse channel in response to receiving the primary transmission; and

thereafter, receive the diversity transmission on a predetermined diversity channel.

29. The UE of claim 28, wherein the processor is further programmed to receive the diversity transmission during a predetermined time interval known to both the UE and the fixed network.

30. The UE of claim 28, wherein the processor is further programmed to receive the primary and diversity channels during first and second time intervals from a first cell, and to receive a second diversity channel from a second cell.

31. The UE of claim 28, wherein the processor is further programmed to transmit the NAK upon a physical random access channel (PRACH).

32. The UE of claim 28,

wherein the primary channel is transmitted from a first cell, and the predetermined diversity channel is transmitted from one of the first cell and a second cell, and

wherein the processor is further programmed to selectively encode the NAK for reception by one of the first and second cells.

33. The UE of claim 32, wherein the processor is further programmed to selectively encode the NAK in response to a first and a second measurement of signal power, the first measurement made on the first cell, and the second measurement made on the second cell.