Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W8/00—Network data management
  • H04W8/26—Network addressing or numbering for mobility support
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0833—Random access procedures, e.g. with 4-step access
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W76/00—Connection management
  • H04W76/10—Connection setup
  • H04W76/11—Allocation or use of connection identifiers

Definitions

• M2M machine-to-machine
• 3GPP 3 rd Generation Partnership Project
• MTC devices machine type communication devices
• MDs machine devices
• a long active/connected mode DRX is said to be used.
• the evolved radio network node of an LTE network eNB
• a context i.e. state information
• a UE in idle mode DRX is in idle mode during both sleep periods and active/listening periods and the eNB thus has no context for the UE.
• the sets of resources that the eNB may transmit the PDCCH signaling on is restricted by certain rules. First, resource elements that may be used for PDCCH signaling are grouped into so-called Control Channel Elements (CCEs). Second!y, only certain combinations of CCEs are allowed.
• CCEs Control Channel Elements
• ⁇ some connections may require multiple RNTIs.
• the above described method is contention based, because two
• EPS Evolved Packet System
• the first user equipment 1 10 may be located in one of the cell(s) of the radio network node 130.
• the user equipment 120 is in some figures referred to as UE 1 10 and is configured to be able to communicate with the radio network node 130 over a radio link indicated by arrow A1.
• the first user equipment 1 10 and the second user equipment 120 are machine type communication devices (MTC devices).
• MTC devices machine type communication devices
• the arrow A2 indicates that the second user equipment 120 and the radio network node 130 are configured for communication with each other over a radio interface, such as E-UTRAN, UTRAN or the like.
• a radio interface such as E-UTRAN, UTRAN or the like.
• the first time period may be monitored by means of a timer, which should be restarted at each uplink (UL) or downlink (DL) communication event involving the first user equipment 1 0 (excluding non-dedicated communication such as broadcast messages e.g. broadcast of system information), e.g. triggered by a scheduling assignment on the PDCCH.
• the timer should be set to a time period that is short enough to avoid the depletion of the C-RNTI bit space, but still long enough not to expire between the data transmissions of a single communication session, e.g. consisting of one or a few subsequent transactions.
• the short-lived C-RNTI may be indicative of the existence of the first extended C-RNTI which is to be used, i.e. stored in the radio network node 130 and the first user equipment 1 10, for identification of the first user equipment 1 10 after the first time period has elapsed and when the first user equipment 1 10 is in the C-RNTI-less connected mode.
• the first set of bits may be referred to as address bits and the second set of bits may be referred to as additional bits.
• the first set of bits of an extended C-RNTI will always belong to the same number space (defined by the number of bits in the first set) as the C-RNTI number space, since the number of bits are equal in a C- RNTI and in a first set.
• Making the extended C-RNTi independent of the short-lived C-RNTI that is allocated to a user equipment provides greater flexibility for the radio network node to choose the extended C-RNTi that it allocates to the user equipment and this may be advantageous in some scenarios. For example, this may make it easier for the radio network node to ensure that not too many user equipments are assigned extended C-RNTIs with identical values of the bits in the first set.
• Another way of identifying the first user equipment 1 10 may be to use international Mobile Subscriber identity (IMSI), S-TMSI or the like. Normally, these values are not available to the radio network node 130, but these may be provided from a core network node managing mobility and/or subscription information.
• IMSI international Mobile Subscriber identity
• S-TMSI Session Initiation Protocol
• the short-lived C-RNTI will not always be used, therefore some way of determining when to use the short-lived C-RNTI may be needed in some
• the radio communication system 100 may determine to assign the short-!ived C-RNTI to the first user equipment 1 10 upon the registration of the first user equipment 110 as connected. The determining is based on one or more of:
• the radio network node may choose to make the transition from assignment of long-lived C-RNTIs to assignment of short-lived C-RNTIs gradual.
• the first extended C-RNTI is used for identification of the first user equipment 1 10. Therefore the first extended C-RNTI needs to be associated, or assigned, and transferred to the first user equipment 1 10.ln order to make both the radio network node 130 and the first user equipment 1 10 aware of the first extended C-RNTI Action 302 is performed.
• the radio network node 130 may associate a first extended C-RNTl to the first user equipment 110.
• the first extended C-RNTI comprises a first set of bits and a second set of bits. The number of bits of the first set is equal to the number of bits of the short-iived C-RNT!.
• the first extended C-RNTI is stored in the radio network node 130.
• the first extended C-RNTI may be sent, by the radio network node 130, to the first user equipment 110, which stores the first extended C-RNTI.
• Action 303 and Action 312 are performed in conjunction with the assignment (as described in action 303 and 312 below) of the short-lived C-RNTI as part of the random access procedure. See for example action 400 in Figure 4 and action 600 in Figure 6. Hence, it is only in some embodiments that a separate message for the association of the first extended C-RNTI is used. Action 303 and Action 312
• the radio communication system 100 registers the first user equipment 1 10 as connected to the radio network node 130.
• the short-lived C-RNTI is assigned to the first user equipment 1 10 for identification thereof during the first time period.
• the radio communication system 100 After the first time period has elapsed, the radio communication system 100 maintains the first user equipment 1 0 connected to the radio network node 130.
• the user equipment is now aware of that special actions as described by embodiments herein for reception or transmission of a transmission are required.
• the DCI message is sent on PDCCH resources, which are dedicated on a per frame basis to be used for PDCCH signalling using addressing (i.e. identification of the user equipment that is the intended receiver of the signalling) based on an extended C-RNT!, and in a frame selected such that a number of bits of a system frame number of the frame is indicative of the second set of bits.
• the frame may be a radio frame.
• the EC-RNTI derived search spaces are used when there are no PDCCH resources that are dedicated for user equipments with allocated EC-RNTIs.
• PDCCH resources in basically any conceivable manner, e.g. defined as certain time slots (e.g. certain subframes), frequency resources (e.g. certain subcarriers) or a combination thereof (e.g. certain resource blocks).
• time slots e.g. certain subframes
• frequency resources e.g. certain subcarriers
• a combination thereof e.g. certain resource blocks.
• the additional bits of the EC-RNTI must point out different search spaces, so that no user equipments which share the same address bits (i.e. the first set of bits, e.g. the 16 least significant bits of the EC-RNTI) get identical search spaces.
• these non- identical search spaces should be non-overlapping to allow as efficient scheduling as possible.
• designing such an algorithm that can handle the most realistic cases e.g.
• the EC-RNTI derived search spaces may be calculated using the same, or similar, algorithm as the search spaces derived from regular C-RNTIs (possibly with modifications or restrictions to limit the search spaces to the PDCCH resources that are dedicated for user equipments with allocated EC-RNTIs, if needed, depending on the way these dedicated resources are defined).
• the 16 bits used in the algorithm instead of the C-RNT! could then be, assuming a 24 bit EC-RNTI, the additional 8 EC-RNTI bits and the 8 most significant bits (or any other defined 8 bits) of the 16 address bits (e.g. the 16 least significant bits of the EC-RNTI).
• An alternative would be to replace the 8 address bits with a predefined bit sequence, e.g. all zeros which might restrict the variability of the EC-RNTI derived search spaces.
• the first set of bits of the first extended C-RNTI are identical to the third set of bits of the second extended C-RNTI, wherein the dedicated search space for the first user equipment 1 10 is at least partly non- overlapping with a second dedicated search space for the second user equipment 120.
• the methods and network nodes according to embodiments herein are needed only for the special situation when the short-lived C-RNTI times out before the timing advance, i.e. it requires that the timing advance timeout is longer than the timeout for the short-lived C-RNTI.
• This may be the case e.g. for user equipments which are known to be stationary and which thus are assigned very long timing advance timeout values, or even infinite timing advance timeout values. Stationary may also be that the user equipment moves very seldom.
• the first user equipment 1 10 may need to perform the random access procedure due to that:
• the first user equipment 1 10 maintains connected to the radio network node 130. This action is similar to action 314.
• the first user equipment 110 refrains from considering the short-lived C-RNIT as assigned to the user equipment 110, thereby enabling use of the short-lived C- RNTI for identification of the second user equipment 120 when connected to the radio network node 130. This action is similar to action 315.
• the page message may further comprise information about a normal/regular C-RNT! to be assigned to the first user equipment 1 10, whereby the C-RNTI is usable for identification of the first user equipment 1 10 in the transmission.
• the transmission may be an uplink transmission from the first user equipment
• the frame may comprise a first and a second set of subframes, wherein the resources are aliocated to the first or second sets of subframes, wherein the first and second sets of subframes are indicative of zero and one, respectively, for at least one bit of the additional bits of the extended C-RNTI.
• the second user equipment 120 is connected to the radio network node 130 while being assigned a second extended C-RNTI and the short-lived C-RNTi is available for reuse by a further user equipment, wherein a number of most significant bits of the first and second extended C-RNTI are identical, wherein the dedicated search space for the first user equipment 1 10 is non- overlapping with a second dedicated search space for the second user equipment 120.
• Action 600 may in some examples be realized by one or more of actions 602, 603 and 604.
• Action 602 is similar to action 301.
• Action 602 is similar to action 301.
• This action is similar to action 304.
• the radio network node 130 may calculate the paging occasion based on the extended C-RNTI. This action is similar to action 307. Action 608
• the radio network node 130 may page at a paging occasion the first user equipment 110 while using the extended C-RNTI for identification of the first user equipment 1 0. This action is similar to action 308.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Databases & Information Systems (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2012
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