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Uplink resource allocation based on historical data for a remotely placed packet controller unit

IP.com Disclosure Number: IPCOM000019004D
Original Publication Date: 2003-Aug-25
Included in the Prior Art Database: 2003-Aug-25
Document File: 8 page(s) / 248K

Publishing Venue

Motorola

Related People

Partha Subramanian: INVENTOR [+3]

Abstract

In General packet radio service (GPRS), the RLC-MAC protocol doesn't allow the network to have any knowledge of the Uplink bandwidth required by the mobile station. In a GPRS network, the remote location of the Packet Controller Unit (PCU) causes a round trip delay between the PCU and the BTS. This results in the network allocating inappropriate amount of Uplink bandwidth to the mobile. However, by implementing a software algorithm at the PCU to monitor trends in the quantity of uplink data in previous uplink packet transfers by the mobile, the PCU can efficiently allocate uplink resources in the future. Additionally, in a PCCCH enabled cell, the network has the capability to identify that the MS needs to transmit upper layer control message and allocate lesser uplink bandwidth (2 blocks) to such mobiles. In this way uplink bandwidth can be used efficiently in the network.

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Title: Uplink resource allocation based on historical data for a remotely placed packet controller unit.

Authors: Partha Subramanian, Tushar Raval, and Damodaran Vasudevan

Abstract

In General packet radio service (GPRS), the RLC-MAC protocol doesn’t allow the network to have any knowledge of the Uplink bandwidth required by the mobile station. In a GPRS network, the remote location of the Packet Controller Unit (PCU) causes a round trip delay between the PCU and the BTS. This results in the network allocating inappropriate amount of Uplink bandwidth to the mobile. However, by implementing a software algorithm at the PCU to monitor trends in the quantity of uplink data in previous uplink packet transfers by the mobile, the PCU can efficiently allocate uplink resources in the future.

Additionally, in a PCCCH enabled cell, the network has the capability to identify that the MS needs to transmit upper layer control message and allocate lesser uplink bandwidth (2 blocks) to such mobiles. In this way uplink bandwidth can be used efficiently in the network.

PROBLEM

·         The remote location of the packet controller unit (PCU) with reference to the BTS creates a round trip delay between the PCU and the BTS.

·         The network is unable to predict the amount of data that a mobile intends to send on the UL and may therefore allocate inappropriate amount of resources (more/less) for a mobile station.

·         Additionally, the lower layers (RLC/MAC) are unable to determine the size of upper layer (LLC) control messages. This results in the network allocating inappropriate amount of resources for the mobile station.

SOLUTION

In order to understand the concept of this invention, the following need to be explained.

Remotely located Packet controller unit: In a GPRS network, the Packet controller unit handles the allocation of packet channel resources and scheduling of packet data. The remote location of the packet controller unit introduces a round trip delay between the PCU and BTS. This round trip delay can be up to 8 block periods or 160 ms (1BP = 20 ms) (Figure 1).

Figure 1 Round Trip Delay in a remotely located PCU

Dynamic allocation of radio resources: On the Uplink, the PCU allocates resources to the mobile by indicating on the downlink block with the mobile’s uplink state flag (USF) value granting the mobile station permission to use the next block on that timeslot to send uplink data. If the PCU grants permission to the mobile at block 0, due to round trip delay between the PCU and the BTS the PCU gets uplink data from the mobile only after 8 block periods (160 msecs.)

Indication of quantity of data: The mobile station indicates the amount of data it has to send to the network in the count down value field in every uplink data block.

Cell Updates & MM procedures: The Logical link control (LLC) layer is a protocol between the SGSN and the mobile. The mobile station and the SGSN exchange control messages at this layer which are invisible lower layers.(RLC/MA...