Processing overload control at base stations of cellular wireless communication systems
First Claim
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1. A method of preventing an overload of call processing capacity at a base station of a cellular wireless communication system, comprising:
- monitoring a level of call processing at the base station with respect to a maximum call processing capacity of the base station, wherein said call processing capacity includes processing of call handoffs, call originations and call terminations handled by the base station;
setting a first call processing threshold which is less than the maximum call processing capacity of the base station;
setting a second call processing threshold which is greater than the first call processing threshold but less than said maximum call processing capacity;
reducing, in a first phase, a present handoff rate for user stations served by the base station when the monitored level of call processing exceeds the first threshold; and
when the monitored level of call processing exceeds the second threshold, reducing, in a second phase, a present rate of at least one of the call originations and call terminations handled by the base station, while further reducing said handoff rate.
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Abstract
Call processing overload at a base station of a cellular wireless network is controlled by monitoring a level of call processing at the base station, and reducing a present handoff rate for active users when the call processing level exceeds a first threshold less than a maximum call processing capacity. When the call processing level at the base station exceeds a second threshold greater than the first threshold, a present rate of call originations or terminations is reduced while further reducing the handoff rate.
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Citations
14 Claims
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1. A method of preventing an overload of call processing capacity at a base station of a cellular wireless communication system, comprising:
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monitoring a level of call processing at the base station with respect to a maximum call processing capacity of the base station, wherein said call processing capacity includes processing of call handoffs, call originations and call terminations handled by the base station;
setting a first call processing threshold which is less than the maximum call processing capacity of the base station;
setting a second call processing threshold which is greater than the first call processing threshold but less than said maximum call processing capacity;
reducing, in a first phase, a present handoff rate for user stations served by the base station when the monitored level of call processing exceeds the first threshold; and
when the monitored level of call processing exceeds the second threshold, reducing, in a second phase, a present rate of at least one of the call originations and call terminations handled by the base station, while further reducing said handoff rate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of preventing an overload of call processing capacity at a base station of a cellular wireless communication system, comprising:
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monitoring a level of call processing at the base station;
reducing, in a first phase, a present handoff rate for user stations served by the base station when the monitored level of call processing exceeds a first threshold which is less than a maximum capacity of call processing at the base station; and
when the monitored level of call processing exceeds a second threshold greater than said first threshold, reducing, in a second phase, a present rate of at least one of call originations and call terminations, while further reducing said handoff rate, wherein the method is implemented according to the following scheme;
set Trigger_flag=0 set N_overload=0 if (RCC_Load>
=RCC_T_handoff)Handoff Reduction Trigger (I) Trigger_flag=1 if (Trigger_flag=1 and RCC_Load<
RCC_T_handoff−
RCC_δ
)Stop Handoff Reduction Trigger Trigger_flag=0 if (RCC_Load>
=RCC_T_access)N_overload=N_overload+1;
Handoff Reduction Trigger (II) T_quality=−
8 dB−
δ
(N_overload)Access Control η
=η
/(2*N_overload)else N_overload=N_overload−
1if N_overload<
0N_overload=0 wherein RCC_T_handoff;
first RCC loading threshold for a first RCC Handoff Reduction Trigger (I),RCC_δ
;
hysteresis constant for avoiding a ping-pong effect when triggering handoff rate reductions,RCC_T_access;
Second RCC loading threshold for a second RCC Access Control Trigger and Handoff Reduction Trigger (II);
η
=step increment for access control factor, andδ
=step increment for call quality factor.- View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification