Fixed HS-DSCH or E-DCH allocation for VOIP (or HS-DSCH without HS-SCCH/E-DCH without E-DPCCH)
View Patent ↗In order to reduce the HS-SCCH overhead, a fixed time allocation approach could be used. In that case, the scheduling time of each VoIP user is semi-static and thus there is no need to transmit e.g. HS-SCCH toward the UE for the initial transmissions, if the UE knows when to receive data on the HS-DSCH and what transport format is used. There are at least two ways of implementing this: 1) HS-SCCH/E-DPCCH signalling to indicate parameters of a first transmission, with subsequent transmissions using the same parameters (and HS-SCCH/E-DPCCH always sent when changes needed), or 2) fixed allocation, RRC signalling used to allocate users and tell the default transport parameters.
1. A method for execution in user equipment, comprising:
reading, at said user equipment, a signalling channel of a radio interface between said user equipment and a radio access network and determining whether there is any signalling information present for said user equipment, said signalling information including transport format parameters to decode data packets of a data channel received from the radio access network,
decoding, by the user equipment, a data packet received on the data channel from said radio access network according to signalling information responsive to determining that said signaling information is present in said signalling channel for said user equipment,
locally storing, in the user equipment, the transport format parameters from the signalling information responsive to determining that said signalling information is present in said signalling channel for said user equipment,
decoding, by the user equipment, said data packet using previously locally stored transport format parameters responsive to determining that said signalling information is not present in said signalling channel for said user equipment, and
delivering decoded said data packet to higher layers of the user equipment.
2. The method of claim 1 , wherein said signalling information is for indicating the transport format parameters of a first transmission with subsequent transmissions using the same transport format parameters comprising said stored transport format parameters.
3. The method of claim 1 , wherein said signalling channel is a high speed shared control channel that employs up to four channels.
4. A non-transitory computer readable medium having computer executable program code stored thereon for that, when executed by a processor in a user equipment, causes the user equipment to perform a plurality of operations comprising:
read a signalling channel and determine whether signalling information for the user equipment is present, the signalling information including transport format parameters for decoding data packets at a data channel;
decode a data packet on the data channel according to the transport format parameters in the signalling information responsive to determining that said signalling information for the user equipment is present;
locally storing the transport format parameters from the signalling information responsive to determining that said signalling information for the user equipment is present;
decode said data packet using the locally stored transport format parameters responsive to determining that said signalling information for the user equipment is not present; and
deliver decoded said data packet to higher layers.
5. A user equipment comprising:
a receiver for receiving a signalling channel and a data channel;
a determiner, for determining whether signalling information for said user equipment is received at the signalling channel;
a memory, for storing transport format parameters for decoding data packets received on the data channel responsive to signalling information for said user equipment being received on said signalling channel; and
a decoder, for decoding a data packet received on the data channel responsive to signalling information for said user equipment being determined as received on said signalling channel for said data packet, and
for using the transport format parameters previously stored in the memory to decode said data packet responsive to no signalling information for said user equipment being determined as received on said signalling channel, and
deliver decoded said data packet to higher layers of the user equipment.
6. The user equipment of claim 5 , wherein said previously stored transport format parameters are for use to decode said data packet only in configured transmission time intervals, and said configured transmission time intervals are determined by periodicity and by a reception window.
7. The user equipment of claim 5 , wherein said signalling information is for indicating the transport format parameters of a first transmission with subsequent transmissions using the same transport format parameters comprising said stored transport format parameters.
8. The user equipment of claim 5 , wherein said signalling channel is a high speed shared control channel that employs up to four channels.
9. The user equipment of claim 5 , wherein said stored transport format parameters are indicated by said signalling from a radio resource control layer.
10. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code configured to, with said at least one processor, cause said apparatus at least to:
read a signalling channel and determine whether signalling information for the apparatus is present, the signalling information including transport format parameters for decoding data packets at a data channel;
decode a data packet on the data channel according to the transport format parameters in the signalling information responsive to determining that said signalling information for the apparatus is present;
locally storing the transport format parameters from the signalling information responsive to determining that said signalling information for the apparatus is present;
decode said data packet using the locally stored transport format parameters responsive to determining that said signalling information for the apparatus is not present; and
deliver decoded said data packet to higher layers.