Figure 5 is a flowchart illustrating an embodiment of a method in a RNC.Moreover, the TSN numbering will start at zero for the data frames received at the RNC for the first access and for those received for the second access.Of course, the foregoing examples and accompanying illustrations are nonlimiting.This operation is achieved by sending all existing data in the buffers to the RLC (i.e. a flush) and then resetting those buffers responsive to reception of a PD.The method comprises receiving data units which comprise a plurality of higher layer data units and a transmission sequence number (TSN).
Manzano, Francisco (Norrbackagatan 16, S-113 41 Stockholm, SE).Thus, in one or more embodiments, the presence of this IE will indicate a new access for any given common E-DCH resource.There are two spare bits for future expansion of the common E-DCH resource indexing range.This category is for images illustrating geometrical properties of circles.Thus, because the RNC does not know when common E-DCH resources are allocated or released, it is recognized herein that there is a possibility of the RNC confusing data between successive random accesses by a UE on the common E-DCH resources.Thus, when a given common E-DCH resource is released, the base station 18 indicates that release to the RNC 20 using the corresponding resource index, e.g. accompanied by a flag or logical indicator indicating the assigned or released state of the common E-DCH resource identified by the index.
In particular, the NodeB assigns one of the common E- DCH resources to a given UE for a given random access by that UE.The E-RNTI seen by the RNC will be the same for the first and second accesses.The allocated resource is subsequently released- either by the UE or based on expiry of an allocation timer- and thus becomes available for a subsequent random access by the same UE or any other UE operating in the cell.Such operation advantageously allows the RNC 20 to differentiate data sent from a UE 22 on a subsequent random access of a given common E-DCH resource from data that is still pending at the RNC 20 for a prior random access by that same UE.The controlling NodeB- a UMTS base station- allocates individual ones of the common E-DCH resources to UEs attempting random access transmissions on the E-DCH, with the allocated resources subsequently being released back into the pool.The method comprises determining an enhanced Dedicated Channel (E-DCH) resource set.TECHNICAL FIELD The present disclosure is generally related to wireless communications networks, and is more particularly related to techniques for data processing in nodes of such networks.SUMMARY The invention is set forth according to the present appended claims.
In one or more embodiments, the reordering problem is solved by re-using existing information elements in the Iub Frame Protocol, with minimal impact on the existing standard.The method 500 further includes using the access indications to differentiate between successive accesses by a same UE 22 on the common uplink resources, and to correspondingly differentiate the processing of given data frames from the UE 22 as belonging to one or the other of the successive accesses, i.e. the first access or the second access (Block 504).In embodiments wherein the access indications comprise index values identifying the different common uplink resources, the RNC 20 is provided with richer information regarding the actual usage characteristics on the common uplink resources.
If that same UE makes a subsequent random access within the timing window of T1, the RNC may receive a data frame in the second access that has the same E-RNTI and TSN value of the data frame missing from the prior access.The presence (or absence) of the PD IE thus serves as an implicit indicator to the RNC 20 as to whether a data frame from a given UE 22 belongs to one access or another.Several examples of such indications are detailed herein for purposes of illustrating relevant operations at the base station 18 and the RNC 20.Further, the MAC-is in the RNC 20 is configured so that it shall always flush and reset all data in the buffers at reception of a data frame that includes the PD.Conversely, receipt of further data frames for the same E-RNTI without receiving PD IEs will be interpreted as a continuation of the most recent random access (subject of course to any normal time-out qualifications, or other protocol controls).
Yet another embodiment introduces an index for each common E-DCH resource.In particular, the network uses a pool of common E-DCH resources that can each be temporarily assigned to a UE in CELL FACH state.Telefonaktiebolaget LM Ericsson (publ) (164 83 Stockholm, SE).The RNC 20 thus recognizes data transmissions associated with separate, successive first and second random accesses by the same UE 22 based on receiving a release indication for the first release.This IE shall be present only if the range of the Propagation Delay IE is insufficient to represent the measured value.
Base stations 18-1, 18-2 and 18-3 provide service in the respective cells 16-1, 16-2, and 16-3.To transmit on a common E-DCH resource, a UE begins transmitting a random access preamble using a transmit power ramping.For example, assume that a UE has sent ten data packets with TSNs of 0 to 9 and then releases the common E-DCH resource used for that access.There are several potential challenges arising from the above arrangement and operation.The NodeB- a base station in the UMTS vernacular-detects the random access preamble and allocates an available common E-DCH resource.As a first possibility, no further data is received from the UE while the MAC-is is waiting for the data missing in the first access.The data frames are received by a MAC-is entity (per E-RNTI) in the RNC 20.
US2005281232 ) discusses a method for reordering uplink data packets in a mobile communication system.Thus, each receipt of a PD IE at the RNC serves as an indication of a new random access.The result will be that the RNC mixed up data from two different data transmissions because it cannot distinguish between different accesses by the same UE.The new cEdchResourceIndex and cEdchToggle are carried in that octet.The RNC performs data re-ordering as needed based on the TSN of the data frames received from a given UE and it differentiates between the data frames received from different UEs based on the E-RNTI.Thus, according to the teachings herein for this embodiment, the base station 18 shall ensure that it includes the PD only in the first data frame from each separate EUL-FACH access.
When the base station 18 has detected the preamble and sent an acknowledgement to the UE 22, the UE 22 starts to transmit its message, either signaling or data, to the network 10.Using the maximum of thirty-two common E-DCH resources currently defined, there would be thirty-two index values.