Access processing method and user equipment
A technology of user equipment and a processing method, which is applied in the field of communication, can solve problems such as prolongation of UE access network access time, lack of fairness, etc., and achieve the effects of improving access delay and system performance
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example 1
[0051] image 3 is a flowchart of an access processing method according to Example 1 of an embodiment of the present invention, as shown in image 3 As shown, the method includes the following steps S301 to S305:
[0052] Step S301, if the terminal encounters preamble failure or contention resolution failure, and the high-level timer (for example, T300) has not expired, the terminal still has a chance to resend MSG1, and executes step S302, if the high-level timer expires, access fail.
[0053] Step S302, if there is a BI sub-header in MSG2 (the BI sub-header is represented by 4 bits, Figure 4 is a schematic diagram of the MAC PDU structure of MSG2 according to the embodiment of the present invention), determine the fallback value corresponding to the BI subheader according to Table 1, and perform step S303, if there is no BI subheader in MSG2, the terminal configures the parameters according to the random access Choose the nearest opportunity to resend MSG1.
[0054] In ...
example 2
[0059] Figure 5 is a schematic diagram of the time delay of the access process according to the embodiment of the present invention. For a terminal that has accessed n times before successfully accessing, it is assumed that the MSG2 received every time MSG1 is sent carries a BI sub-header, and it is assumed that each time The failures are all due to preamble failure (if the reason for failure is the failure of contention resolution, the situation is similar), then the access delay consists of three parts: (1) When n-1 failed accesses, it will wait for a total of n -1 Transmission Time Interval (Transmission Time Interval, referred to as TTI) window (TTI Window); (2) The waiting time after the n-1th failure and before re-initiating access, this value is based on the sequence number in the BI instruction The maximum backoff value obtained by looking up the table, the backoff value is randomly selected according to the uniform distribution within the range of [0, backoff value];...
example 3
[0071] Assume that two UEs send MSG1 at the same time, and the MAC header of MSG2 received by the two UEs from the base station contains a BI subheader, and there is no matching RAPID in the RAR subheader (that is, preamble failure). Let UE1 send for the kth time, and UE2 send for the lth time (and l>k). According to Table 1, the fallback value corresponding to the BI subheader is BV.
[0072] According to the above algorithm, when retransmitting, the fallback value of UE1 is The fallback value for UE2 is UE1 has more fallback time than UE2 According to a uniform distribution, the mean value of the fallback value will decrease When the BV is large or the difference between l and k is large, the difference between the back-off mean values of UE1 and UE2 is also larger, which significantly improves access fairness and access delay.
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