Abstract
A method and apparatus for a wireless transmit receive unit (WTRU) to use a contention-based uplink communications channel applies a rule-based restriction of access to the contention-based uplink channel that attempts to use at least one contention-free uplink channel allocation for uplink transmissions on a condition that at least one contention-free uplink channel allocation has been granted.
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Technologies
Scheduling request (SR)
Product
Use Cases
Wireless communication
Services
Claim
1. A method implemented by a wireless transmit receive unit (WTRU) accessing a contention-based (CB) uplink communication channel, the method comprising:
deciding whether to send an uplink transmission using the CB uplink communication channel or a contention-free uplink channel allocation based on a rule-based restriction of access to the CB uplink communication channel;
restricting access to the CB uplink communication channel on a condition that at least one rule of the rule-based restriction is satisfied; and
on a condition that more than one uplink grant is received for a same sub-frame, deciding not to send an uplink transmission on the CB uplink communication channel on a condition that at least one uplink grant is received in a random access response.', 'deciding whether to send an uplink transmission using the CB uplink communication channel or a contention-free uplink channel allocation based on a rule-based restriction of access to the CB uplink communication channel;', 'restricting access to the CB uplink communication channel on a condition that at least one rule of the rule-based restriction is satisfied; and', 'on a condition that more than one uplink grant is received for a same sub-frame, deciding not to send an uplink transmission on the CB uplink communication channel on a condition that at least one uplink grant is received in a random access response.
2. The method as in claim 1, wherein the rule-based restriction is based on a number of sub-frames since a scheduling request for a contention-free channel was transmitted.
3. The method as in claim 1, wherein the rule-based restriction is based on a number of sub-frames since a successful transmission of a buffer status report (BSR).
4. The method as in claim 1, wherein the rule-based restriction is based on transmission of an uplink shared channel within a set number of frames.
5. The method as in claim 1, further comprising the WTRU monitoring statistics of uplink contention-based resource usage and uplink contention-free resource usage, where based on the monitoring, the WTRU determines whether to use the CB uplink communication channel or determines a probability of access to the CB uplink communication channel.
6. The method as in claim 1, further comprising the WTRU transmitting data on the CB uplink communication channel; and cancelling a triggered BSR.
7. The method as in claim 1, wherein the WTRU has a pending scheduling request (SR), further comprising receiving a valid CB uplink grant; transmitting on a CB uplink communication channel in a sub-frame; and cancelling a random access channel (RACH) preamble transmission in the sub-frame.
8. The method as in claim 1, wherein the WTRU has a pending scheduling request (SR), further comprising receiving a valid CB uplink grant; transmitting a RACH preamble in a sub-frame; and prohibiting transmission on the CB uplink communication channel in the sub-frame.
9. The method as in claim 1, further comprising receiving more than one uplink grant for a sub-frame; wherein the WTRU does not transmit on the CB uplink communication channel on condition that at least one contention-free grant is received for a cell radio network temporary identifier (C-RNTI) or a temporary C-RNTI of the WTRU.', "10. The method as in claim 1, further comprising receiving more than one uplink grant for a sub-frame; wherein the WTRU does not transmit on the CB uplink communication channel on condition that at least one uplink grant is received to initialize semi-persistent scheduling (SPS) on a contention-free uplink channel for the WTRU's SPS cell radio network temporary identifier (C-RNTI)."11. The method as in claim 1, further comprising receiving more than one uplink grant for a sub-frame; wherein the WTRU does not transmit on the CB uplink communication channel on condition that the WTRU is to perform a non-adaptive retransmission in the sub-frame in response to receiving a NACK
12. A wireless transmit receive unit (WTRU), comprising a processor configured to access a contention-based (CB) uplink communication channel, and decide whether to send an unlink transmission using a the CB uplink communication channel or a contention-free uplink channel allocation based on a rule-based restriction of access to the CB uplink communication channel, and restrict access to the CB uplink communication channel on a condition that at least one rule of the rule-based restriction is satisfied; and
the processor further configured to decide not to send an uplink transmission on the CB uplink communication channel on a condition that more than one uplink grant is received for a same sub-frame and that at least one uplink grant is received in a random access response.', 'the processor further configured to decide not to send an uplink transmission on the CB uplink communication channel on a condition that more than one uplink grant is received for a same sub-frame and that at least one uplink grant is received in a random access response
13. The WTRU as in claim 12, wherein the rule-based restriction is based on a number of sub-frames since a scheduling request was transmitted
14. The WTRU as in claim 12, wherein the rule-based restriction is based on a number of sub-frames since a successful transmission of a buffer status report (BSR)
15. The WTRU as in claim 12, wherein the rule-based restriction is based on transmission of an uplink shared channel within a set number of frames
16. The WTRU as in claim 12, wherein the processor is further configured to monitor statistics of uplink contention-based resource usage and uplink contention-free resources usage, where based on the monitoring, the processor determines whether to use the CB uplink communication channel or determines a probability of access to the CB uplink communication channel
17. The WTRU as in claim 12, wherein the processor is further configured to transmit data on the CB uplink communication channel; and cancel a triggered BSR
18. The WTRU as in claim 12, wherein the processor has a pending scheduling request (SR), the processor further configured to receive a valid CB uplink grant; transmit on a CB uplink communication channel in a sub-frame; and cancel a random access channel (RACH) preamble transmission in the sub-frame
19. The WTRU as in claim 12, wherein the processor has a pending scheduling request (SR), the processor further configured to receive a valid CB uplink grant; transmit a RACH preamble in a sub-frame; and prohibit transmission on the CB uplink communication channel in the sub-frame.
20. The WTRU as in claim 12, wherein the processor is further configured to receive more than one uplink grant for a sub-frame; and the processor decides not to transmit on the CB uplink communication channel on condition that at least one contention-free grant is received for a cell radio network temporary identifier (C-RNTI) or a temporary C-RNTI of the WTRU.', "21. The WTRU as in claim 12, wherein the processor is further configured to receive more than one uplink grant for a sub-frame; and the processor decides not to transmit on the CB uplink communication channel on condition that at least one uplink grant is received to initialize semi-persistent scheduling (SPS) on a contention-free uplink channel for the WTRU's SPS cell radio network temporary identifier (C-RNTI).", '22. The WTRU as in claim 12, wherein the processor is further configured to receive more than one uplink grant for a sub-frame; and the processor decides not to transmit on the CB uplink communication channel on condition that the WTRU is to perform a non-adaptive retransmission in the sub-frame in response to receiving a NACK.']
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