Abstract
Soft handoff in an OFDMA system is disclosed. If the pilot signal strength for a base station exceeds the defined threshold the base station is added to an active set list. Subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols are divided and allocated into subchannels. The OFDM symbols are divided and multiplexed. A soft handoff zone with a first dimension of the subchannels and a second dimension of the divided and multiplexed OFDM symbols is defined. The soft handoff zone has subcarriers with a subchannel definition for example an identical permutation.
| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration
Product
Use Cases
Wireless communication
Services
Claim
1. A method for facilitating soft handoffs in an orthogonal frequency division multiplexing access (OFDMA) system comprising the steps of:
a) dividing subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols;
b) allocating said divided subcarriers into subchannels;
c) dividing and multiplexing said plurality of OFDM symbols;
d) defining a soft handoff zone comprising a first dimension of said subchannels and a second dimension of said divided and multiplexed plurality of OFDM symbols, said soft handoff zone having a first plurality of subcarriers, said first plurality of subcarriers having a subchannel definition; and
e) transmitting said first plurality of subcarriers in said soft handoff zone to a station.', 'a) dividing subcarriers in a plurality of orthogonal frequency division multiplexing (OFDM) symbols;', 'b) allocating said divided subcarriers into subchannels;', 'c) dividing and multiplexing said plurality of OFDM symbols;', 'd) defining a soft handoff zone comprising a first dimension of said subchannels and a second dimension of said divided and multiplexed plurality of OFDM symbols, said soft handoff zone having a first plurality of subcarriers, said first plurality of subcarriers having a subchannel definition; and', 'e) transmitting said first plurality of subcarriers in said soft handoff zone to a station.
2. The method according to claim 1, wherein said subchannel definition is identical for each of said first plurality of subcarriers.
3. The method according to claim 1, wherein said subchannel definition is a subcarrier permutation.
4. The method according to claim 3, wherein said subcarrier permutation is distributed.
5. The method according to claim 3, wherein said subcarrier permutation is adjacent.
6. The method according to claim 1, wherein the steps of dividing subcarriers in a plurality of OFDM symbols and allocating said divided subcarriers into subchannels are performed in a frequency domain.
7. The method according to claim 1, wherein said station is a subscriber station in a soft handoff area, and said first plurality of subcarriers in said soft handoff zone are transmitted in a downlink from a base station to said subscriber station.
8. The method according to claim 7, wherein said base station is a first base station, further comprising the step of transmitting a second plurality of subcarriers in said soft handoff zone from one or more than one second base stations to said subscriber station concurrently, said first base station and said one or more than one second base stations forming a macro-diversity transmission.
9. The method according to claim 8, further comprising the step of combining radio frequency (RF) signals from said macro-diversity transmission from said first base station and said one or more than one second base stations
10. The method according to claim 8, wherein said first plurality of subcarriers transmitted between said first base station and said subscriber station is different from said second plurality of subcarriers transmitted between said one or more than one second base stations and said subscriber station, thus achieving higher throughput
11. The method according to claim 7, wherein all subchannels are allocated to a transmitter
12. The method according to claim 7, wherein some subchannels are allocated to a transmitter
13. The method according to claim 8, further comprising the step of demodulating signals from said macro-diversity transmission from said first base station and said one or more than one second base stations separately, and combining received data at Log Likelihood Ratio (LLR) level
14. The method according to claim 8, further comprising the step of turning off one of said base stations for providing interference avoidance
15. The method according to claim 14, further comprising the step of turning off one of said base stations based on a pre-determined assignment on said plurality of subcarriers
16. The method according to claim 14, further comprising the step of turning off one of said base stations in an active set list on said plurality of subcarriers
17. The method according to claim 8, further comprising the step of combining the macro-diversity transmission from said first base station and said one or more than one second base stations, said macro-diversity transmission having different subcarrier permutation and different connection identifier (CID)
18. The method according to claim 8, further comprising the step of combining the macro-diversity transmission from said first base station and said one or more than one second base stations, said macro-diversity transmission having different subcarrier permutation and same connection identifier (CID)
19. The method according to claim 8, wherein said macro-diversity transmission is a multi-input multi-output (MIMO) transmission, wherein said first base station and said one or more than one second base stations provide a plurality of antennas to form an antenna pool, further comprising a step of selecting transmitting antennas from said antenna pool.
20. The method according to claim 19, wherein said MIMO transmission is based on space-frequency coding (SFC).
21. The method according to claim 19, wherein said MIMO transmission is based on space multiplexing coding (SM).
22. The method according to claim 19, wherein said first plurality of subcarriers and said second plurality of subcarriers are identical, and all or some antennas in said antenna pool transmit said OFDM symbols in a same data region, further comprising the step of combining radio frequency (RF) signals from said first base station and said one or more than one second base stations.
23. The method according to claim 19, wherein said first plurality of subcarriers is transmitted through a first set of antennas in a first data region, and said second plurality of subcarriers is transmitted through a second set of antennas in a second data region of a same size, further comprising the step of soft-combining said first plurality of subcarriers and said second plurality of subcarriers to achieve diversity combining and soft combining gain.
24. The method according to claim 19, wherein said first plurality of subcarriers is transmitted through a first set of antennas in a first data region, and said second plurality of subcarriers is transmitted through a second set of antennas in a second data region, further comprising the step of separately decoding said first plurality of subcarriers and said second plurality of subcarriers to achieve data rate increase.
25. The method according to claim 19, wherein said first plurality of subcarriers transmitted through a first set of antennas can be synchronous to said second plurality of subcarriers transmitted through a second set of antennas.
26. The method according to claim 19, wherein said first plurality of subcarriers transmitted through a first set of antennas can be asynchronous to said second plurality of subcarriers transmitted through a second set of antennas.
27. The method according to claim 19, wherein said MIMO transmission is based on space-time coding (STC).
28. The method according to claim 27, wherein said STC is space-time-transmit diversity (STTD).
29. The method according to claim 27, wherein said STC is space-frequency-transmit diversity (SFTD).
30. The method according to claim 1, wherein said station is a subscriber station in a soft handoff area, and said first plurality of subcarriers in said soft handoff zone are transmitted in a downlink from a base station on an active set list to said subscriber station.
31. The method according to claim 1, wherein said station is a base station, and said first plurality of subcarriers in said soft handoff zone is transmitted in an uplink from a subscriber station to said base station.
32. The method according to claim 1, wherein said station is a base station on an active set list, and said first plurality of subcarriers in said soft handoff zone is transmitted in an uplink from a subscriber station to said base station.
33. The method according to claim 1, wherein said dividing and multiplexing step is time division multiplexing.
34. The method according to claim 1, wherein said dividing and multiplexing step is frequency division multiplexing.
35. The method according to claim 1, wherein said dividing and multiplexing step uses space-time code (STC).
36. The method according to claim 1, wherein said dividing and multiplexing step is spatial multiplexing.
37. The method according to claim 1, further comprising the step of allocating pilot subcarriers into subchannels first, and allocating data carriers into remaining subchannels.
38. The method according to claim 1, further comprising the step of allocating used subcarriers into subchannels first, and allocating pilot subcarriers into said subchannels.']
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ClaimChart-US8249024B2-STO
Patent number:US8249024B2
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.