PRIORITIZED RANDOM ACCESS METHOD
First Claim
1. A prioritized random access method, adapted for a base station detecting random access congestion, comprising:
- classifying random access attempts of wireless communication devices into at least a priority level according to delay requirements of the random access attempts;
associating each of the priority levels respectively with a set of dedicated random access opportunities;
broadcasting default configuration of the dedicated random access opportunities;
receiving random access messages from the wireless communication devices;
detecting congestion of the random access messages;
changing the dedicated random access opportunities when the congestion of some random access messages is detected; and
notifying the change of the dedicated random access opportunities by a response message to some wireless communication devices, whose transmitted random access messages are congested.
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Abstract
Prioritized random access methods are proposed. According to an embodiment, random access attempts are classified into the priority levels according to delay requirements, and adedicated random access opportunities are reserved for different priority levels. A congestion detecting mechanism is introduced for such dedicated ranging (random access) opportunities. When congestion is detected by the base station, parameters or configurations of random access can be dynamically or temporarily modified through random access response message. Furthermore, a prioritized contention resolution is introduced to guarantee a high priority access is processed earlier than a low priority access. According to another embodiment, another prioritized contention resolution is introduced to reduce the impact of random access of a low priority M2M device upon H2H traffic.
83 Citations
32 Claims
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1. A prioritized random access method, adapted for a base station detecting random access congestion, comprising:
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classifying random access attempts of wireless communication devices into at least a priority level according to delay requirements of the random access attempts; associating each of the priority levels respectively with a set of dedicated random access opportunities; broadcasting default configuration of the dedicated random access opportunities; receiving random access messages from the wireless communication devices; detecting congestion of the random access messages; changing the dedicated random access opportunities when the congestion of some random access messages is detected; and notifying the change of the dedicated random access opportunities by a response message to some wireless communication devices, whose transmitted random access messages are congested. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A prioritized random access method, adapted for a wireless communication device achieving prioritized contention resolution, comprising:
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using a random access opportunity to transmit a random access message with a base station; receiving a random access response from the base station as a response for the random access message, wherein the random access response comprises an uplink grant; receiving an indication from the base station; and determining to give up uplink grant from the base station according to the indication and the priority level of the random access message. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A prioritized random access method, adapted for a wireless communication device transmitting a delay-sensitive message, comprising:
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transmitting a first random access message using a first random access code from a code set Ca(0) of a default configuration for a priority Pa; receiving a first random access response with a first indicator from the base station, wherein the first indicator indicates the default configuration being changed to a current configuration i; determining whether a code set Ca(i) of the current configuration, i, is the same as the code set Ca(0) of the default configuration; determining whether the first random access message is successful according to the first random access response; transmitting subsequent request message by using allocated uplink grant from the base station when the first random access message is successful and the code set Ca(i) is the same as the code set Ca(0); completing network entry; and transmitting the delay-sensitive message. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A prioritized random access method, adapted for a wireless communication device performing a network entry, the prioritized random access method comprising:
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transmitting a first random access message using a first random access code from a code set CIN(0) arranged for initial random access of a default configuration; receiving a first random access response with a first indicator from the base station, wherein the first indicator indicates the default configuration being changed to a current configuration i; determining whether the first random access code belongs to the code set CIN(i) of the current configuration i; determining whether the first random access message is successful according to the first random access response; transmitting subsequent request message by using allocated uplink grant from the base station when the first random access code belongs to the code set CIN(i) and the first random access message is successful; and completing the network entry. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification