RLC window size reconfiguration
First Claim
1. A telecommunications device comprising:
- a transceiver which enables the device to communicate over an air interface;
a radio link control (RLC) entity which forms uplink RLC protocol data units (PDUs) for transmission over the air interface and which receives downlink RLC protocol data units (PDUs) over the air interface;
a radio link control (RLC) buffer memory configured to include a transmitter buffer for storing the uplink RLC protocol data units (PDUs) and a receiver buffer for storing the downlink RLC protocol data units (PDUs); and
characterized by;
RLC reconfiguration logic means which is arranged to reconfigure at least one of a size of a transmitter buffer window and a size of a receiver buffer window by implementing a strategy for handling at least one of (a) downlink RLC protocol data units (PDUs) which are outside a new receiver buffer window; and
(2) uplink RLC protocol data units (PDUs) which are either outside a new transmitter window or whose receipt by the radio access network has not been positively acknowledged.
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0 Petitions
Accused Products
Abstract
A telecommunications device comprises a transceiver (33); a radio link control entity (50); and, a radio link control (RLC) buffer memory (150). The transceiver (33) which enables the device to communicate over an air interface (32). The radio link control entity (50) forms uplink RLC protocol data units (PDUs) for transmission over the air interface (32) and receives downlink RLC protocol data units (PDUs) over the air interface (32). The radio link control (RLC) buffer memory (150) is configured to include a transmitter buffer for storing the uplink RLC protocol data units (PDUs) and a receiver buffer for storing the downlink RLC protocol data units (PDUs). The radio link control entity includes RLC reconfiguration logic means (200) which reconfigures at least one of a size of a transmitter buffer window and a size of a receiver buffer window. In performing the reconfiguration, the RLC reconfiguration logic means implements a strategy for handling at least one of (1) downlink RLC protocol data units (PDUs) which are outside a new receiver buffer window; and (2) uplink RLC protocol data units (PDUs) which are either outside a new transmitter window or whose receipt by the radio access network has not been positively acknowledged.
69 Citations
21 Claims
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1. A telecommunications device comprising:
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a transceiver which enables the device to communicate over an air interface; a radio link control (RLC) entity which forms uplink RLC protocol data units (PDUs) for transmission over the air interface and which receives downlink RLC protocol data units (PDUs) over the air interface; a radio link control (RLC) buffer memory configured to include a transmitter buffer for storing the uplink RLC protocol data units (PDUs) and a receiver buffer for storing the downlink RLC protocol data units (PDUs); and characterized by; RLC reconfiguration logic means which is arranged to reconfigure at least one of a size of a transmitter buffer window and a size of a receiver buffer window by implementing a strategy for handling at least one of (a) downlink RLC protocol data units (PDUs) which are outside a new receiver buffer window; and
(2) uplink RLC protocol data units (PDUs) which are either outside a new transmitter window or whose receipt by the radio access network has not been positively acknowledged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a user equipment unit which communicates over an air interface with a radio access network, the method comprising the steps of:
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using a radio link control entity to form uplink RLC protocol data units (PDUs) for transmission over the air interface and to receive downlink RLC protocol data units (PDUs) over the air interface; storing the uplink RLC protocol data units (PDUs) in a transmitter buffer of a radio link control (RLC) buffer memory; storing the downlink RLC protocol data units (PDUs) in a receiver buffer of the radio link control (RLC) buffer memory; during a RLC reconfiguration wherein the user equipment unit is directed to reconfigure at least one of (a) a size of a transmitter buffer window to form a new transmitter buffer window having a transmitter buffer window size smaller than an old transmitter buffer window; and
(b) a size of a receiver buffer window to form a new receiver buffer window having a receiver buffer window size smaller than an old receiver buffer window;discarding any downlink RLC protocol data units (PDUs) that were received as being within the old receiver buffer window but which are outside the new receiver buffer window; and
,retaining in the radio link control (RLC) buffer memory any uplink RLC protocol data units (PDUs) whose receipt by the radio access network has not been positively acknowledged. - View Dependent Claims (13, 14, 15)
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16. A method of operating a user equipment unit which communicates over an air interface with a radio access network, the method comprising the steps of:
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using a radio link control entity to form uplink RLC protocol data units (PDUs) for transmission over the air interface and to receive downlink RLC protocol data units (PDUs) over the air interface); storing the uplink RLC protocol data units (PDUs) in a transmitter buffer of a radio link control (RLC) buffer memory; storing the downlink RLC protocol data units(PDUs) in a receiver buffer of the radio link control (RLC) buffer memory; during a RLC reconfiguration wherein the user equipment unit is directed to reconfigure at least one of (a) a size of a transmitter buffer window to form a new transmitter buffer window having a transmitter buffer window size smaller than an old transmitter buffer window; and
(b) a size of a receiver buffer window to form a new receiver buffer window having a receiver buffer window size smaller than an old receiver buffer window;retaining all downlink RLC protocol data units (PDUs) stored in the receiver buffer even if outside the new receiver buffer window until the receiver buffer window can be advanced; and
,retaining any uplink RLC protocol data units (PDUs) stored in the transmitter buffer, whose receipt by the radio access network has not been positively acknowledged, even if outside the new transmitter buffer window. - View Dependent Claims (17, 18, 19, 20)
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21. A method of operating a radio access node of a radio access network which communicates over an air interface with a user equipment unit, the method comprising the steps of:
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using a radio link control entity to form uplink RLC protocol data units (PDUs) for transmission over the air interface and to receive downlink RLC protocol data units (PDUs) over the air interface; storing the uplink RLC protocol data units (PDUs) in a transmitter buffer of a radio link control (RLC) buffer memory; storing the downlink RLC protocol data units (PDUs) in a receiver buffer of the radio link control (RLC) buffer memory; during a RLC reconfiguration, reconfiguring at least one of a size of a transmitter buffer window and a size of a receiver buffer window by; (A) retaining all downlink RLC protocol data units (PDUs) upon reconfiguration; and
,(B) retaining all uplink RLC protocol data units (PDUs) upon reconfiguration.
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Specification