Reducing delay in setting up calls
First Claim
1. A method for reducing delay associated with a call set-up for a call between an originating communication unit and a target communication unit in a radio access system (RAS), the method comprising:
- initiating the call between the originating communication unit and the target communication unit prior to a channel assignment;
estimating a first latency between an initiation time associated with the call and a first time when the target communication unit is capable of receiving a notification of the call by comparing the first time with a wake-up time for the target communication unit using a time value associated with the RAS and a slot offset time associated with the target communication unit;
estimating a second latency between the initiation time and a second time when the target communication unit is capable of receiving the notification of the call by comparing the second time with the wake-up time for the target communication unit using the time value associated with the RAS and the slot offset time associated with the target communication unit; and
sending an address associated with the target communication unit to the RAS on one of a first channel and a second channel based on the first latency and the second latency.
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Abstract
A method (600) and apparatus (700) for reducing delay associated with a call set-up for a call between an originating communication unit (120) and a target communication unit (121–124) in a radio access system (RAS) (101) is described. A call is initiated with a target communication unit prior to a channel assignment. A first latency (411) between an initiation time and a time when the target is capable of receiving a notification of the call on a first channel (410) is estimated and a second latency (421) between the initiation time and a second time when the target is capable of receiving the notification on a second channel (420) is estimated. Addresses associated with the target can be sent to the radio access system on the first channel or the second channel based on the estimated first latency and the estimated second latency.
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Citations
17 Claims
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1. A method for reducing delay associated with a call set-up for a call between an originating communication unit and a target communication unit in a radio access system (RAS), the method comprising:
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initiating the call between the originating communication unit and the target communication unit prior to a channel assignment; estimating a first latency between an initiation time associated with the call and a first time when the target communication unit is capable of receiving a notification of the call by comparing the first time with a wake-up time for the target communication unit using a time value associated with the RAS and a slot offset time associated with the target communication unit; estimating a second latency between the initiation time and a second time when the target communication unit is capable of receiving the notification of the call by comparing the second time with the wake-up time for the target communication unit using the time value associated with the RAS and the slot offset time associated with the target communication unit; and sending an address associated with the target communication unit to the RAS on one of a first channel and a second channel based on the first latency and the second latency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for reducing delay in a group call setup for a group call between an originating communication unit and a plurality of target communication units in a radio access system (RAS), the method comprising:
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sorting a list of addresses associated with the plurality of target communication units according to a latency value between a first time and a second time associated with each of the plurality of target communication units, the list sorted to provide one or more first addresses to be transmitted to the RAS over a first channel and one or more second addresses to be transmitted to the RAS over a second channel, the sorting performed when the group call set-up is impending; and initiating, at the first time, the group call between the originating communication unit and the plurality of target communication units by transmitting the first addresses from the originating communication unit to the RAS over the first channel. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus in a radio access system (RAS) capable of participating in a call, the apparatus comprising:
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an interface capable of coupling to the RAS and a target communication unit; a memory; and a processor coupled to the memory and the interface, the memory storing instructions for causing the processor to; estimate a first time delay associated with completing the call with the target communication unit if an address of the target communication unit is transmitted to the RAS over a first channel and to estimate the first time delay to compare a first time with a wake up time for the target communication unit using a time value associated with the RAS and a slot offset time associated with the target communication unit; and estimate a second time delay associated with completing the call with the target communication unit if the address of the target communication unit is transmitted to the RAS over a second channel and to estimate the second time delay to compare a second time with the wake up time for the target communication unit using the time value associated with the RAS and the slot offset time associated with the target communication unit, wherein the completing the call includes a notification time when a notification of the call is capable of being received. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification