WO2013138048A1 - Random access channel enhancements for lte devices - Google Patents
Random access channel enhancements for lte devices Download PDFInfo
- Publication number
- WO2013138048A1 WO2013138048A1 PCT/US2013/027350 US2013027350W WO2013138048A1 WO 2013138048 A1 WO2013138048 A1 WO 2013138048A1 US 2013027350 W US2013027350 W US 2013027350W WO 2013138048 A1 WO2013138048 A1 WO 2013138048A1
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- WIPO (PCT)
- Prior art keywords
- packet aggregation
- background
- enb
- packets
- transmitting
- Prior art date
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- 238000000034 method Methods 0.000 claims abstract description 57
- 230000002776 aggregation Effects 0.000 claims description 91
- 238000004220 aggregation Methods 0.000 claims description 91
- 238000012545 processing Methods 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 14
- 239000000872 buffer Substances 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000007774 longterm Effects 0.000 claims description 3
- 230000004931 aggregating effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
Classifications
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Definitions
- LTE Long Term Evolution
- 3 GPP 3rd Generation Partnership Project
- QoS quality of service
- a mobile terminal referred to as user equipment
- UE uplink
- eNB evolved node B
- PRACH physical random access channel
- the PRACH is a specific set of time-frequency resources allocated by eN B for use by LJEs in performing the RA procedure. If periodic scheduling request (SR) resources are not allocated to the UE by the network, the random access process is also used by the UE to acquire uplink resources for all subsequent data transmission.
- PRACH resources are shared among users who are in connected mode as well as users who are in idle mode. Since the same PRACH resources are used for random access procedure by multiple UEs, collisions can occur.
- the PRACH is expected to operate with very low collision rates, but if the number of users increases, the collision rate increases as well as the error rate.
- the LTE standard specifies a back-off mechanism for preamble retransmission for general users in order to avoid further collisions, but there is no solution specific to users running background traffic. As noted above, background traffic is different in the sense that it does not have a stringent latency requirement and has relatively very small packet transmissions.
- FIG. 1 illustrates a UE and an eNB in accordance with some embodiments.
- Fig. 2 illustrates the random access procedure in accordance with some embodiments.
- FIGs. 3A-3B illustrate an example algorithm for performing background packet aggregation in accordance with some embodiments.
- the network or eNB informs the UEs which run background traffic to use a timer, referred to herein as a packet aggregation timer.
- a packet aggregation timer When the UE acquires the value for initializing the packet aggregation timer, referred to as the packet aggregation timer initialization value, the timer is started. For new UL packet arrivals due to background traffic, the UE then aggregates or buffers all the packet arrival s for the duration of timer.
- FIG. 1 shows an example of a UE 100 and an eNB 150.
- the UE 100 and eNB 150 incorporate processing circuitries 110 and 160, respectively, each of which is intended to represent any type of hardware/software
- the processing circuitry 1 10 in the UE 100 is interfaced to one or a plurality of RF transceivers 120 that are each connected to one of a plurality of antennas 130.
- the processing circuitry 160 in the eNB 150 is interfaced to a plurality of R F transceivers 170 that are each connected to one of a plurality of antennas 180.
- the UE 100 may be, for example, a mobile phone or other portable computing device.
- Fig. 1 shows a user interface 1 1 1 which could be, for example, a keyboard or touch screen.
- the user interface 111 enables a user of the device to communicate with the processing circuitry 110, which communication may include setting of certain parameters as discussed below. Also shown is a batter ⁇ ' indicator 112 for indicating the charge state of a battery to the processing circuitry 110.
- the physical layer of LTE is based upon orthogonal frequency division multiplexing (OFDM) for the downlink and a related technique, single carrier frequency division multiplexing (SC-FDM), for the uplink.
- OFDM orthogonal frequency division multiplexing
- SC-FDM single carrier frequency division multiplexing
- the downlink and uplink transmissions are organized into radio frames each having a duration of 10 ms.
- Each radio frame consists of 10 sub-frames, each sub-frame consisting of two consecutive 0.5 ms slots.
- Each slot comprises six OFDM symbols for an extended cyclic prefix and seven OFDM symbols for a normal cyclic prefix.
- data is time and frequency multiplexed by mapping OFDM symbols to a time/frequency resource grid consisting of elementary units called resource elements (REs) that are uniquely identified by the antenna port, sub-carrier position, and OFDM symbol index within a radio frame.
- resource elements REs
- a group of resource elements corresponding to twelve consecutive subcarriers within a single slot is referred to as a resource block (RB).
- a UE When a UE is in a connected state, all uplink and downlink resources are allocated by the eNB. At the physical level, those resources are segregated into separate physical channels. The UE is allocated resources in the physical uplink control channel (PUCCH) for requesting resources for transmitting data to the eNB over the physical uplink shared channel (PUSCH). If the UE has not been allocated resources on the PUCCH for transmitting such a scheduling request, the UE may use a random access procedure for the scheduling request.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- PRACH physical random access channel
- SIB system information block
- Random access may be used by a UE for several purposes including; for initial access to establish a connection with an eNB, for transitioning from an idle state to a connected state, for establishing or re-establishing synchronization with the eNB including receiving a timing advance parameter to compensate for the time it takes for uplink transmissions to reach the eNB, and during a handover process to a new cell.
- the random access procedure begins when the mobile transmits a random access preamble on the physical random access channel (PRACH). This initiates an exchange of messages between the mobile and the base station that may be either non-contention-based or contention-based.
- PRACH physical random access channel
- the mobile receives resources for uplink transmission, an initial value for the uplink timing advance and, if it does not already have one, a C-RNTI (cell-specific radio network temporary identifier) that identifies the UE and enables the UE to decode information in the physical downlink control channel (PDCCH) intended for it.
- Fig. 2 illustrates the steps involved in performing a contention-based RA procedure.
- the UE transmits a random-access preamble using the PRACH.
- the preamble transmission indicates to the eNB the presence of a UE performing a random access procedure and also allows the eNB to estimate the transmission delay between the UE and eNB for adj usting the uplink timing.
- the eNB transmits the random access response which includes a timing advance command to the UE to allow it to adjust the timing of its uplink transmission based on the timing estimate obtained in step Al and also assigns uplink resources to the terminal to be used in the next step.
- the transmission at step A2 is over a PDSCH resource identified with a PDCCH transmission reserved for random access responses.
- the random access response may also include a back-off command that instructs a UE to delay before attempting random access again.
- the UE transmits an identification message to the eNB using a PUSCH resource assigned to the UE by step A2.
- the identification message may also include a scheduling request.
- the eNB transmits a grant message to the UE using the PDSCH which resolves any contention due to multiple UEs performing a random access procedure using the same preamble and receiving the same random access response from the eNB. If the random access procedure is successful, the UE is granted uplink resources.
- a non-contention-based random access procedure would involve only steps Al and A2 using a dedicated preamble allocated to the UE by the eNB.
- a scheduling request can be transmitted over the PUCCH in order to obtain the PUSCH resources to transmit the background traffic if the UE has been allocated PUCCH resources or such traffic can be included with other data if the UE has already been allocated PU SCH resources. If the UE has not been allocated such uplink resources, the random access procedure may be used. Because multiple UEs use the same PRACH resource in step Al of the random access procedure as described above for several purposes, the repetitive use of the random access procedure for transmitting small background packets increases the probability of collisions between UEs in attempting to access the PRACH. Also, performing a multiple random access procedure for transmitting each small background packet is burdensome to a UE's limited battery power supply. The background packet aggregation technique as described herein ameliorates both of these problems.
- Figs, 3A-3B An example of an algorithm that may be performed by a UE is illustrated by Figs, 3A-3B.
- the UE is configured to optional ly operate in a background packet aggregation mode in which background packets are buffered rather than immediately transmitted using a random access procedure to request uplink resources.
- the UE is inhibited from accessing the PRACH, if such access is for the purpose of transmitting background traffic, until expiration of the background packet aggregation timer, at which point the buffered packets may be transmitted using a random access procedure.
- the UE checks to see if a packet aggregation timer initialization value has been received from the eNB or other network entity. Such a received initialization value is used as a command from the eNB for the UE to enter the packet aggregation mode.
- a packet aggregation timer initialization value is used as a command from the eNB for the UE to enter the packet aggregation mode.
- the command may be transmitted as some other type of message, in certain embodiments, the packet aggregation timer value or other command can be broadcast by the eNB using the master information block (MIB) or using a system information block (SIB).
- MIB master information block
- SIB system information block
- the UE determines if the received value is a command from the eN B or other network entity to exit the packet aggregation mode.
- a command may take the form of a specified initialization value (e.g., zero-valued) or an explicit command message.
- the UE exits the packet aggregation mode and stops the packet aggregation timer at step B3 before returning to step Bl .
- the UE stores the value at step B4.
- the UE also checks to see if a condition is detected for autonomously entering the background packet aggregation mode at step B5. Such conditions may include, for example, a low batter ⁇ ' state or an excessive level of background traffic.
- the UE starts the packet aggregation timer if it is not already running and enters the background packet aggregation mode at step B6.
- the UE then starts (or continues) to store background packets in the aggregation buffer performing a random access procedure for their transmission at step B7, This buffering continues until the packet aggregation timer expires as determined at step B8, at which point a random access procedure is performed to transmit the buffered packets at step B9.
- the UE then checks if an exit condition is present for exiting the background packet aggregation mode at step BIO, Such conditions could include, for example, a command from the eNB, a user command via a user input, and/or the absence of conditions for autonomously entering the packet aggregation mode if those conditions were solely responsible for the UE initiating the mode. If such exit conditions are present, the UE exits the packet aggregation mode at step B12 and returns to steps Bl and B5. Otherwise, the UE restarts the packet aggregation timer with the stored initialization value at step Bl 1 and returns to step B7.
- an exit condition could include, for example, a command from the eNB, a user command via a user input, and/or the absence of conditions for autonomously entering the packet aggregation mode if those conditions were solely responsible for the UE initiating the mode. If such exit conditions are present, the UE exits the packet aggregation mode at step B12 and returns to steps Bl and B5. Otherwise, the
- a device operating as a UE in an LTE network includes: an RF transceiver for providing an LTE air interface for communicating with a base station operating as an enhanced/evolved Node B (eNB); and processing circuitiy interfaced to the RF transceiver and arranged to, if no uplink resources for transmitting scheduling requests to the eNB are currently allocated to the device, starting a packet aggregation timer and transmitting background packets having a relaxed latency requirement by buffering the background packets until the packet aggregation timer expires at which point uplink resources are requested from the eNB for transmitting the buffered background packets via a random access procedure.
- eNB enhanced/evolved Node B
- the processing circuitry may be configured to reset the packet aggregation timer to a stored packet aggregation timer initialization value after expiration while in the packet aggregation mode.
- the device may be configured to optionally operate in a background packet aggregation mode, in which background packets are buffered until the packet aggregation time expires, or to not operate the background packet aggregation mode.
- the processing circuitiy' in the example embodiment may be further arranged to: receive the packet aggregation timer initialization value from the eNB (or other network entity) and store the received value; request a lesser packet aggregation timer initialization value from the eNB if the rate at which background packets are being received for transmission exceeds a specified threshold; enter the background packet aggregation mode upon receiving a positive packet aggregation timer initialization value from the eNB; exit the background packet aggregation mode upon receiving a command to do so from the eNB, where the command from the eNB to exit the packet aggregation mode may be a specified packet aggregation timer initialization value; enter the background packet aggregation mode upon receipt of a user command via a user input; request uplink resources from the eNB for transmitting the buffered background packets prior to expiration of the packet aggregation timer if the number of background packets that have been buffered exceeds a specified threshold; when operating in the
- the background packet aggregation buffer may be emptied prior to expiration of the background packet aggregation timer even while in the background packet aggregation mode if certain conditions are met.
- the UE may transmit the buffered background packets via a random access procedure prior to expiration of the packet aggregation timer if the number of background packets that have been buffered exceeds a specified threshold.
- the buffered packets may be transmitted prior to expiration of the background packet aggregation timer while in the background packet aggregation mode if uplink resources are al located to the UE for some other reason.
- the embodiments as described above may be implemented in various hardware configurations that may include a processor for executing instructions that perform the techniques described. Such instructions may be contained in a suitable storage medium from which they are transferred to a memory or other processor-executable medium.
- Antennas referred to herein may comprise one or more directional or omnidirectional antennas, including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas or other types of antennas suitable for transmission of RF signals.
- a single antenna with multiple apertures may be used instead of two or more antennas.
- each aperture may be considered a separate antenna.
- antennas may be effectively separated to take advantage of spatial diversity and the different channel characteristics that may result between each of antennas and the antennas of a transmitting station.
- antennas may ⁇ be separated by up to 1 /10 of a wavelength or more.
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