Methods and arrangements in a radio communications system

Abstract

The user equipment comprises a radio transmitter arranged to transmit data packets to a receiver on an uplink channel and a receiver arranged to receive data packets transmitted from a transmitter on a downlink channel. The user equipment comprises circuitry that analyzes the received data packets.

1 . A method in a communication network entity of improving a performance of data packet transmissions between two user equipments via said communication network entity over an uplink transmission link and a downlink transmission link, whereby a pre-defined transmission delay is allowed for said data packets to travel from one of said user equipments to the other of said user equipments, the method comprising the steps of:
 analysing for said downlink transmission link received data packets originating from said uplink transmission link, said analysing comprising estimating a Packet Inter-arrival Time (PIT) by monitoring arrival of individual packets;   estimating a transmission delay on said uplink transmission link based on said analysed data packets;   determining remaining transmission delay for said downlink transmission link;   selecting for said analysed data packets an action based on said determined remaining transmission delay which efficiently uses available radio resources on said downlink transmission link, whereafter said data packets are transmitted on said downlink transmission link to a receiving user equipment.   
     
     
         2 . The method according to  claim 1 , wherein said action is to determine maximum allowed re-transmissions on said downlink transmission link for individual data packets based on said determined remaining transmission delay. 
     
     
         3 . The method according to  claim 1 , wherein said action is to select a modulation and coding scheme (MCS) based on a number of allowed re-transmissions based on said determined remaining transmission delay in order to obtain an optimal robustness. 
     
     
         4 . The method according to  claim 1 , wherein said action is to determine a time-out value for individual data packets based on said determined remaining transmission delay. 
     
     
         5 . The method according to  claim 1 , wherein said step of estimating the PIT comprises measuring a number of packets arrived during a pre-determined period of time. 
     
     
         6 . A method of improving a performance of data packet transmissions, the method comprising, in a user equipment:
 receiving data packets on a downlink transmission link from a communication network entity, in which communication network entity data packets originating from an uplink transmission link have been analysed, a transmission delay on said uplink transmission link based on said analysed data packets has been estimated, a remaining transmission delay for the downlink transmission link has been determined and an action for said analysed data packets has been selected based on said determined remaining transmission delay which efficiently uses available radio resources on said downlink transmission link;   analysing said received data packets, said step of analysing comprising the step of estimating a Packet Inter-arrival Time (PIT) by monitoring arrival of individual packets.   
     
     
         7 . The method according to  claim 6 , wherein said analysis comprises obtaining a determined maximum allowed re-transmissions on said downlink transmission link. 
     
     
         8 . The method according to  claim 6 , wherein said analysis comprises obtaining a determined time-out value for individual data packets. 
     
     
         9 . The method according to  claim 6 , wherein said step of estimating the PIT comprises measuring a number of packets arrived during a pre-determined period of time. 
     
     
         10 . A communication network entity for improving the performance of data packet transmissions, said entity comprising circuitry configured to:
 analyse for a downlink transmission link received data packets originating from an uplink transmission link, said circuitry configured to estimate a Packet Inter-arrival Time (PIT) by monitoring arrival of individual packets;   estimate a transmission delay on said uplink transmission link based on said analysed data packets;   determine remaining transmission delay for said downlink transmission link;   select for said analysed data packets an action based on said determined remaining transmission delay which efficiently uses available radio resources on said downlink transmission link, whereafter said data packets are transmitted on said downlink transmission link to a receiving user equipment.   
     
     
         11 . A communication network entity according to  claim 10 , wherein said circuitry is configured to determine maximum allowed re-transmissions on said downlink transmission link for individual data packets based on said determined remaining transmission delay. 
     
     
         12 . A communication network entity according to  claim 10 , wherein said circuitry is configured to select a modulation and coding scheme (MCS) based on a number of allowed re-transmissions based on said determined remaining transmission delay in order to obtain an optimal robustness. 
     
     
         13 . A communication network entity according to  claim 10 , wherein said circuitry is configured to determine a time-out value for individual data packets based on said determined remaining transmission delay. 
     
     
         14 . A communication network entity according to  claim 10 , wherein said circuitry is configured to estimate the PIT by measuring a number of packets arrived during a pre-determined period of time. 
     
     
         15 . A user equipment for improving the performance of data packet transmissions between two user equipments via a communication network entity over an uplink transmission link and a downlink transmission link, whereby a pre-defined transmission delay is allowed for said data packets to travel from one user equipment to said user equipment, the user equipment comprising circuitry configured to:
 receive data packets on said downlink transmission link from said communication network entity, in which communication network entity said data packets originating from said uplink transmission link have been analysed, a transmission delay on said uplink transmission link based on said analysed data packets has been estimated, a remaining transmission delay for said downlink transmission link has been determined and an action for said analysed data packets has been selected based on said determined remaining transmission delay which efficiently uses available radio resources on said downlink transmission link;   analyse said received data packets to estimate a Packet Inter-arrival Time (PIT) by monitoring arrival of individual packets.   
     
     
         16 . A user equipment according to  claim 15 , wherein said circuitry is configured to obtain a determined maximum allowed re-transmissions on said downlink transmission link. 
     
     
         17 . A user equipment according to  claim 15 , wherein said circuitry is configured to obtain a determined time-out value for individual data packets. 
     
     
         18 . A user equipment according to  claim 15 , wherein said circuitry is configured to estimate the PIT by measuring a number of packets arrived during a pre-determined period of time