Granted Patent
B2
US 12,368,624 · App. 17/985,074 · Granted Jul 22, 2025
Methods and apparatus for random access in multi-carrier communication systems
Inventors:
Xiaodong Li (Kirkland, WA); Titus Lo (Bellevue, WA); Kemin Li (Bellevue, WA); Haiming Huang (Bellevue, WA)
Assignee:
Neo Wireless LLC
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Abstract
Methods and apparatus in a multi-carrier cellular wireless network with random access improve receiving reliability and reduce interference of uplink signals of a random access, while improving the detection performance of a base station receiver by employing specifically configured ranging signals.
Claims (26)
1. A method, comprising:
transmitting, by a device in an orthogonal frequency division multiple access (OFDMA) cellular system, a ranging signal via a non-contiguous subset of blocks of a ranging subchannel comprising a plurality of contiguous blocks, each block comprising a plurality of consecutive subcarriers,
wherein an inter-block frequency spacing between each pair of blocks of the ranging subchannel is different than the inter-block frequency spacing between each other pair of blocks of the ranging subchannel; and
transmitting, by the device, data over a subchannel comprising at least the plurality of contiguous blocks of the ranging subchannel.
2. The method of claim 1 , wherein each block of the non-contiguous subset of blocks comprises a plurality of subcarriers, and wherein transmitting the ranging signal further comprises transmitting, in at least one block of the non-contiguous subset of blocks, a signal having a lower power on a lowest subcarrier of the block than a power of a next lowest subcarrier of the block.
3. The method of claim 2 , wherein transmitting the ranging signal further comprises transmitting, in the at least one block, a signal having a lower power on a highest subcarrier of the block than a power of a next highest subcarrier of the block.
4. The method of claim 2 , wherein, in the at least one block, the power of the lowest subcarrier of the block is zero.
5. The method of claim 4 , wherein, in the at least one block, the lowest subcarrier of the block is silent.
6. The method of claim 1 , wherein transmitting the ranging signal further comprises transmitting a sequence of orthogonal frequency division multiplexing (OFDM) symbols.
7. The method of claim 6 , wherein the sequence of OFDM symbols comprises a plurality of segments of OFDM symbols.
8. The method of claim 7 , wherein each segment of the sequence of OFDM symbols is different from each other segment of the sequence.
9. The method of claim 7 , wherein each segment of the sequence is OFDM symbols is orthogonal to a corresponding segment of a transmitted second ranging signal of the OFDMA cellular system.
10. The method of claim 9 , further comprising transmitting, by the device, the ranging signal while the second ranging signal is transmitted.
11. A device in an orthogonal frequency division multiple access (OFDMA) cellular system, comprising:
a transmitter, configured to transmit a ranging signal via a non-contiguous subset of blocks of a ranging subchannel comprising a plurality of contiguous blocks, each block comprising a plurality of consecutive subcarriers,
wherein an inter-block frequency spacing between each pair of blocks of the ranging subchannel is different than the inter-block frequency spacing between each other pair of blocks of the ranging subchannel; and
wherein the transmitter is further configured to transmit data over a subchannel comprising at least the plurality of contiguous blocks of the ranging subchannel.
12. The device of claim 11 , wherein each block of the non-contiguous subset of blocks comprises a plurality of subcarriers, and wherein the transmitter is further configured to transmit, in at least one block of the non-contiguous subset of blocks, a signal having a lower power on a lowest subcarrier of the block than a power of a next lowest subcarrier of the block.
13. The device of claim 12 , wherein the transmitter is further configured to transmit, in the at least one block, a signal having a lower power on a highest subcarrier of the block than a power of a next highest subcarrier of the block.
14. The device of claim 12 , wherein, in the at least one block, the power of the lowest subcarrier of the block is zero.
15. The device of claim 14 , wherein, in the at least one block, the lowest subcarrier of the block is silent.
16. The device of claim 11 , the transmitter is further configured to transmit a sequence of orthogonal frequency division multiplexing (OFDM) symbols.
17. The device of claim 16 , wherein the sequence of OFDM symbols comprises a plurality of segments of OFDM symbols.
18. The device of claim 17 , wherein each segment of the sequence of OFDM symbols is different from each other segment of the sequence.
19. The device of claim 17 , wherein each segment of the sequence is OFDM symbols is orthogonal to a corresponding segment of a transmitted second ranging signal of the OFDMA cellular system.
20. The device of claim 19 , wherein the transmitter is further configured to transmit the ranging signal while the second ranging signal is transmitted.
Continuity (8)
Continuation
10583158
Provisional Application
60551589
· Mar 9, 2004
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